diff --git a/swad_center.c b/swad_center.c
index 56d834da..ced54aaf 100644
--- a/swad_center.c
+++ b/swad_center.c
@@ -1776,29 +1776,33 @@ void Ctr_GetMyCenters (void)
    if (!Gbl.Usrs.Me.MyCtrs.Filled)
      {
       Gbl.Usrs.Me.MyCtrs.Num = 0;
+      Gbl.Usrs.Me.MyCtrs.Ctrs = NULL;
 
       /***** Get my centers from database *****/
       NumCtrs = Ctr_DB_GetCtrsFromUsr (&mysql_res,
                                        Gbl.Usrs.Me.UsrDat.UsrCod,-1L);
-      for (NumCtr = 0;
-	   NumCtr < NumCtrs;
-	   NumCtr++)
-	{
-	 /* Get next center */
-	 row = mysql_fetch_row (mysql_res);
-
-	 /* Get center code */
-	 if ((CtrCod = Str_ConvertStrCodToLongCod (row[0])) > 0)
+      if (NumCtrs)
+        {
+	 if ((Gbl.Usrs.Me.MyCtrs.Ctrs = malloc (NumCtrs *
+						sizeof (*Gbl.Usrs.Me.MyCtrs.Ctrs))) == NULL)
+            Err_NotEnoughMemoryExit ();
+	 for (NumCtr = 0;
+	      NumCtr < NumCtrs;
+	      NumCtr++)
 	   {
-	    if (Gbl.Usrs.Me.MyCtrs.Num == Ctr_MAX_CENTERS_PER_USR)
-	       Err_ShowErrorAndExit ("Maximum number of centers of a user exceeded.");
+	    /* Get next center */
+	    row = mysql_fetch_row (mysql_res);
 
-	    Gbl.Usrs.Me.MyCtrs.Ctrs[Gbl.Usrs.Me.MyCtrs.Num].CtrCod = CtrCod;
-	    Gbl.Usrs.Me.MyCtrs.Ctrs[Gbl.Usrs.Me.MyCtrs.Num].MaxRole = Rol_ConvertUnsignedStrToRole (row[1]);
+	    /* Get center code */
+	    if ((CtrCod = Str_ConvertStrCodToLongCod (row[0])) > 0)
+	      {
+	       Gbl.Usrs.Me.MyCtrs.Ctrs[Gbl.Usrs.Me.MyCtrs.Num].HieCod  = CtrCod;
+	       Gbl.Usrs.Me.MyCtrs.Ctrs[Gbl.Usrs.Me.MyCtrs.Num].MaxRole = Rol_ConvertUnsignedStrToRole (row[1]);
 
-	    Gbl.Usrs.Me.MyCtrs.Num++;
+	       Gbl.Usrs.Me.MyCtrs.Num++;
+	      }
 	   }
-	}
+        }
 
       /***** Free structure that stores the query result *****/
       DB_FreeMySQLResult (&mysql_res);
@@ -1818,6 +1822,10 @@ void Ctr_FreeMyCenters (void)
      {
       /***** Reset list *****/
       Gbl.Usrs.Me.MyCtrs.Filled = false;
+      if (Gbl.Usrs.Me.MyCtrs.Num &&
+	  Gbl.Usrs.Me.MyCtrs.Ctrs)
+         free (Gbl.Usrs.Me.MyCtrs.Ctrs);
+      Gbl.Usrs.Me.MyCtrs.Ctrs = NULL;
       Gbl.Usrs.Me.MyCtrs.Num    = 0;
      }
   }
@@ -1837,7 +1845,7 @@ bool Ctr_CheckIfIBelongToCtr (long CtrCod)
    for (NumMyCtr = 0;
         NumMyCtr < Gbl.Usrs.Me.MyCtrs.Num;
         NumMyCtr++)
-      if (Gbl.Usrs.Me.MyCtrs.Ctrs[NumMyCtr].CtrCod == CtrCod)
+      if (Gbl.Usrs.Me.MyCtrs.Ctrs[NumMyCtr].HieCod == CtrCod)
          return true;
    return false;
   }
diff --git a/swad_center.h b/swad_center.h
index 532fd973..eed27e2d 100644
--- a/swad_center.h
+++ b/swad_center.h
@@ -36,12 +36,6 @@
 #include "swad_map.h"
 #include "swad_role_type.h"
 
-/*****************************************************************************/
-/************************** Public types and constants ***********************/
-/*****************************************************************************/
-
-#define Ctr_MAX_CENTERS_PER_USR	 10 // Used in list of my centers
-
 /*****************************************************************************/
 /****************************** Public prototypes ****************************/
 /*****************************************************************************/
diff --git a/swad_changelog.h b/swad_changelog.h
index e1236f45..c1548043 100644
--- a/swad_changelog.h
+++ b/swad_changelog.h
@@ -632,10 +632,11 @@ TODO: Francisco Javier Fern
 Me sale este error, no sé si por no recordar yo la sintaxis apropiada para mandar a varios destinatarios. ¿No era así?
 "can npt create received message (duplicated entry '243218-2160773' for key 'UsrCod_MsgCod')
 */
-#define Log_PLATFORM_VERSION	"SWAD 23.20.1 (2023-10-02)"
+#define Log_PLATFORM_VERSION	"SWAD 23.21 (2023-10-03)"
 #define CSS_FILE		"swad23.16.1.css"
 #define JS_FILE			"swad22.49.js"
 /*
+	Version 23.21:    Oct 03, 2023  User's hierarchy is allocated dinamically. (336598 lines)
 	Version 23.20.1:  Oct 02, 2023  Fixed minor CSS issue in games and exams. (336576 lines)
 	Version 23.20:    Sep 29, 2023  Removed button to change between view and edit mode in in file browser. (336571 lines)
 	Version 23.19.1:  Sep 29, 2023  Code refactoring in file browser. (336609 lines)
diff --git a/swad_chat.c b/swad_chat.c
index cc549fd7..a19c25f3 100644
--- a/swad_chat.c
+++ b/swad_chat.c
@@ -175,7 +175,7 @@ void Cht_ShowListOfAvailableChatRooms (void)
 	      NumMyDeg++)
 	   {
 	    /* Get data of this degree */
-	    Deg.HieCod = Gbl.Usrs.Me.MyDegs.Degs[NumMyDeg].DegCod;
+	    Deg.HieCod = Gbl.Usrs.Me.MyDegs.Degs[NumMyDeg].HieCod;
 	    if (!Deg_GetDegreeDataByCod (&Deg))
 	       Err_WrongDegreeExit ();
 
@@ -362,9 +362,10 @@ void Cht_WriteParsRoomCodeAndNames (const char *RoomCode,const char *RoomShrtNam
 /******************************* Enter a chat room ***************************/
 /*****************************************************************************/
 
-#define Cht_MAX_BYTES_ROOM_CODES      ((2 + Deg_MAX_DEGREES_PER_USR + Crs_MAX_COURSES_PER_USR) * Cht_MAX_BYTES_ROOM_CODE)
-#define Cht_MAX_BYTES_ROOM_SHRT_NAMES ((2 + Deg_MAX_DEGREES_PER_USR + Crs_MAX_COURSES_PER_USR) * Cht_MAX_BYTES_ROOM_SHRT_NAME)
-#define Cht_MAX_BYTES_ROOM_FULL_NAMES ((2 + Deg_MAX_DEGREES_PER_USR + Crs_MAX_COURSES_PER_USR) * Cht_MAX_BYTES_ROOM_FULL_NAME)
+// TODO: Max. bytes should be allocated dinamycally depending on number of degrees and courses
+#define Cht_MAX_BYTES_ROOM_CODES      (100 * Cht_MAX_BYTES_ROOM_CODE)
+#define Cht_MAX_BYTES_ROOM_SHRT_NAMES (100 * Cht_MAX_BYTES_ROOM_SHRT_NAME)
+#define Cht_MAX_BYTES_ROOM_FULL_NAMES (100 * Cht_MAX_BYTES_ROOM_FULL_NAME)
 
 void Cht_OpenChatWindow (void)
   {
@@ -386,9 +387,9 @@ void Cht_OpenChatWindow (void)
    char ThisRoomCode[Cht_MAX_BYTES_ROOM_CODE + 1];
    char ThisRoomShortName[Cht_MAX_BYTES_ROOM_SHRT_NAME + 1];
    char ThisRoomFullName [Cht_MAX_BYTES_ROOM_FULL_NAME + 1];
-   char ListRoomCodes     [Cht_MAX_BYTES_ROOM_CODES      + 1];
+   char ListRoomCodes    [Cht_MAX_BYTES_ROOM_CODES      + 1];
    char ListRoomShrtNames[Cht_MAX_BYTES_ROOM_SHRT_NAMES + 1];
-   char ListRoomFullNames [Cht_MAX_BYTES_ROOM_FULL_NAMES + 1];
+   char ListRoomFullNames[Cht_MAX_BYTES_ROOM_FULL_NAMES + 1];
    FILE *FileChat;
    FILE *FileOut = Fil_GetOutputFile ();
 
@@ -470,14 +471,14 @@ void Cht_OpenChatWindow (void)
 	NumMyDeg++)
      {
       snprintf (ThisRoomCode,sizeof (ThisRoomCode),"DEG_%ld",
-		Gbl.Usrs.Me.MyDegs.Degs[NumMyDeg].DegCod);
+		Gbl.Usrs.Me.MyDegs.Degs[NumMyDeg].HieCod);
       if (strcmp (RoomCode,ThisRoomCode))
         {
          Str_Concat (ListRoomCodes,"|#",sizeof (ListRoomCodes) - 1);
          Str_Concat (ListRoomCodes,ThisRoomCode,sizeof (ListRoomCodes) - 1);
 
          /* Get data of this degree */
-         Deg.HieCod = Gbl.Usrs.Me.MyDegs.Degs[NumMyDeg].DegCod;
+         Deg.HieCod = Gbl.Usrs.Me.MyDegs.Degs[NumMyDeg].HieCod;
          Deg_GetDegreeDataByCod (&Deg);
 
          snprintf (ThisRoomShortName,sizeof (ThisRoomShortName),"%s",
@@ -497,14 +498,14 @@ void Cht_OpenChatWindow (void)
 	NumMyCrs++)
      {
       snprintf (ThisRoomCode,sizeof (ThisRoomCode),"CRS_%ld",
-		Gbl.Usrs.Me.MyCrss.Crss[NumMyCrs].CrsCod);
+		Gbl.Usrs.Me.MyCrss.Crss[NumMyCrs].HieCod);
       if (strcmp (RoomCode,ThisRoomCode))
         {
          Str_Concat (ListRoomCodes,"|#",sizeof (ListRoomCodes) - 1);
          Str_Concat (ListRoomCodes,ThisRoomCode,sizeof (ListRoomCodes) - 1);
 
          /* Get data of this course */
-         Crs.HieCod = Gbl.Usrs.Me.MyCrss.Crss[NumMyCrs].CrsCod;
+         Crs.HieCod = Gbl.Usrs.Me.MyCrss.Crss[NumMyCrs].HieCod;
          Crs_GetCourseDataByCod (&Crs);
 
          snprintf (ThisRoomShortName,sizeof (ThisRoomShortName),
diff --git a/swad_country.c b/swad_country.c
index 69f6c3f1..8d134503 100644
--- a/swad_country.c
+++ b/swad_country.c
@@ -1790,28 +1790,32 @@ void Cty_GetMyCountrs (void)
    if (!Gbl.Usrs.Me.MyCtys.Filled)
      {
       Gbl.Usrs.Me.MyCtys.Num = 0;
+      Gbl.Usrs.Me.MyCtys.Ctys = NULL;
 
       /***** Get my institutions from database *****/
       NumCtys = Cty_DB_GetCtysFromUsr (&mysql_res,Gbl.Usrs.Me.UsrDat.UsrCod);
-      for (NumCty = 0;
-	   NumCty < NumCtys;
-	   NumCty++)
-	{
-	 /* Get next country */
-	 row = mysql_fetch_row (mysql_res);
-
-	 /* Get country code */
-	 if ((CtyCod = Str_ConvertStrCodToLongCod (row[0])) > 0)
+      if (NumCtys)
+        {
+	 if ((Gbl.Usrs.Me.MyCtys.Ctys = malloc (NumCtys *
+						sizeof (*Gbl.Usrs.Me.MyCtys.Ctys))) == NULL)
+            Err_NotEnoughMemoryExit ();
+	 for (NumCty = 0;
+	      NumCty < NumCtys;
+	      NumCty++)
 	   {
-	    if (Gbl.Usrs.Me.MyCtys.Num == Cty_MAX_COUNTRS_PER_USR)
-	       Err_ShowErrorAndExit ("Maximum number of countries of a user exceeded.");
+	    /* Get next country */
+	    row = mysql_fetch_row (mysql_res);
 
-	    Gbl.Usrs.Me.MyCtys.Ctys[Gbl.Usrs.Me.MyCtys.Num].CtyCod  = CtyCod;
-	    Gbl.Usrs.Me.MyCtys.Ctys[Gbl.Usrs.Me.MyCtys.Num].MaxRole = Rol_ConvertUnsignedStrToRole (row[1]);
+	    /* Get country code */
+	    if ((CtyCod = Str_ConvertStrCodToLongCod (row[0])) > 0)
+	      {
+	       Gbl.Usrs.Me.MyCtys.Ctys[Gbl.Usrs.Me.MyCtys.Num].HieCod  = CtyCod;
+	       Gbl.Usrs.Me.MyCtys.Ctys[Gbl.Usrs.Me.MyCtys.Num].MaxRole = Rol_ConvertUnsignedStrToRole (row[1]);
 
-	    Gbl.Usrs.Me.MyCtys.Num++;
+	       Gbl.Usrs.Me.MyCtys.Num++;
+	      }
 	   }
-	}
+        }
 
       /***** Free structure that stores the query result *****/
       DB_FreeMySQLResult (&mysql_res);
@@ -1831,7 +1835,11 @@ void Cty_FreeMyCountrs (void)
      {
       /***** Reset list *****/
       Gbl.Usrs.Me.MyCtys.Filled = false;
-      Gbl.Usrs.Me.MyCtys.Num    = 0;
+      if (Gbl.Usrs.Me.MyCtys.Num &&
+	  Gbl.Usrs.Me.MyCtys.Ctys)
+         free (Gbl.Usrs.Me.MyCtys.Ctys);
+      Gbl.Usrs.Me.MyCtys.Ctys = NULL;
+      Gbl.Usrs.Me.MyCtys.Num = 0;
      }
   }
 
@@ -1850,7 +1858,7 @@ bool Cty_CheckIfIBelongToCty (long CtyCod)
    for (NumMyCty = 0;
         NumMyCty < Gbl.Usrs.Me.MyCtys.Num;
         NumMyCty++)
-      if (Gbl.Usrs.Me.MyCtys.Ctys[NumMyCty].CtyCod == CtyCod)
+      if (Gbl.Usrs.Me.MyCtys.Ctys[NumMyCty].HieCod == CtyCod)
          return true;
    return false;
   }
diff --git a/swad_country.h b/swad_country.h
index cc188aa0..dbb2cb3d 100644
--- a/swad_country.h
+++ b/swad_country.h
@@ -40,8 +40,6 @@
 /************************** Public types and constants ***********************/
 /*****************************************************************************/
 
-#define Cty_MAX_COUNTRS_PER_USR	 10	// Used in list of my countries
-
 #define Cty_MAX_CHARS_NAME	(48 - 1)	// 47
 #define Cty_MAX_BYTES_NAME	((Cty_MAX_CHARS_NAME + 1) * Str_MAX_BYTES_PER_CHAR - 1)	// 767
 
diff --git a/swad_course.c b/swad_course.c
index 50cc2364..fb5e5d96 100644
--- a/swad_course.c
+++ b/swad_course.c
@@ -600,8 +600,8 @@ void Crs_WriteSelectorMyCoursesInBreadcrumb (void)
 		 NumMyCrs < Gbl.Usrs.Me.MyCrss.Num;
 		 NumMyCrs++)
 	      {
-	       CrsCod = Gbl.Usrs.Me.MyCrss.Crss[NumMyCrs].CrsCod;
-	       DegCod = Gbl.Usrs.Me.MyCrss.Crss[NumMyCrs].DegCod;
+	       CrsCod = Gbl.Usrs.Me.MyCrss.Crss[NumMyCrs].HieCod;
+	       DegCod = Gbl.Usrs.Me.MyCrss.Crss[NumMyCrs].PrtCod;
 
 	       Crs_DB_GetShortNamesByCod (CrsCod,CrsShortName,DegShortName);
 
diff --git a/swad_course.h b/swad_course.h
index 37e79b48..f0c2a6e4 100644
--- a/swad_course.h
+++ b/swad_course.h
@@ -40,8 +40,6 @@
 /***************************** Public constants ******************************/
 /*****************************************************************************/
 
-#define Crs_MAX_COURSES_PER_USR		100 // Used in list of my courses and list of distinct courses in sent or received messages
-
 #define Crs_MIN_MONTHS_WITHOUT_ACCESS_TO_REMOVE_OLD_CRSS  6
 #define Crs_DEF_MONTHS_WITHOUT_ACCESS_TO_REMOVE_OLD_CRSS 12
 #define Crs_MAX_MONTHS_WITHOUT_ACCESS_TO_REMOVE_OLD_CRSS 60
diff --git a/swad_degree.c b/swad_degree.c
index 3c9b1840..1962bb48 100644
--- a/swad_degree.c
+++ b/swad_degree.c
@@ -1658,29 +1658,33 @@ void Deg_GetMyDegrees (void)
    if (!Gbl.Usrs.Me.MyDegs.Filled)
      {
       Gbl.Usrs.Me.MyDegs.Num = 0;
+      Gbl.Usrs.Me.MyDegs.Degs = NULL;
 
       /***** Get my degrees from database *****/
       NumDegs = Deg_DB_GetDegsFromUsr (&mysql_res,
                                        Gbl.Usrs.Me.UsrDat.UsrCod,-1L);
-      for (NumDeg = 0;
-	   NumDeg < NumDegs;
-	   NumDeg++)
-	{
-	 /* Get next degree */
-	 row = mysql_fetch_row (mysql_res);
-
-	 /* Get degree code */
-	 if ((DegCod = Str_ConvertStrCodToLongCod (row[0])) > 0)
+      if (NumDegs)
+        {
+	 if ((Gbl.Usrs.Me.MyDegs.Degs = malloc (NumDegs *
+						sizeof (*Gbl.Usrs.Me.MyDegs.Degs))) == NULL)
+            Err_NotEnoughMemoryExit ();
+	 for (NumDeg = 0;
+	      NumDeg < NumDegs;
+	      NumDeg++)
 	   {
-	    if (Gbl.Usrs.Me.MyDegs.Num == Deg_MAX_DEGREES_PER_USR)
-	       Err_ShowErrorAndExit ("Maximum number of degrees of a user exceeded.");
+	    /* Get next degree */
+	    row = mysql_fetch_row (mysql_res);
 
-	    Gbl.Usrs.Me.MyDegs.Degs[Gbl.Usrs.Me.MyDegs.Num].DegCod  = DegCod;
-	    Gbl.Usrs.Me.MyDegs.Degs[Gbl.Usrs.Me.MyDegs.Num].MaxRole = Rol_ConvertUnsignedStrToRole (row[1]);
+	    /* Get degree code */
+	    if ((DegCod = Str_ConvertStrCodToLongCod (row[0])) > 0)
+	      {
+	       Gbl.Usrs.Me.MyDegs.Degs[Gbl.Usrs.Me.MyDegs.Num].HieCod  = DegCod;
+	       Gbl.Usrs.Me.MyDegs.Degs[Gbl.Usrs.Me.MyDegs.Num].MaxRole = Rol_ConvertUnsignedStrToRole (row[1]);
 
-	    Gbl.Usrs.Me.MyDegs.Num++;
+	       Gbl.Usrs.Me.MyDegs.Num++;
+	      }
 	   }
-	}
+        }
 
       /***** Free structure that stores the query result *****/
       DB_FreeMySQLResult (&mysql_res);
@@ -1700,6 +1704,10 @@ void Deg_FreeMyDegrees (void)
      {
       /***** Reset list *****/
       Gbl.Usrs.Me.MyDegs.Filled = false;
+      if (Gbl.Usrs.Me.MyDegs.Num &&
+	  Gbl.Usrs.Me.MyDegs.Degs)
+         free (Gbl.Usrs.Me.MyDegs.Degs);
+      Gbl.Usrs.Me.MyDegs.Degs = NULL;
       Gbl.Usrs.Me.MyDegs.Num    = 0;
      }
   }
@@ -1719,7 +1727,7 @@ bool Deg_CheckIfIBelongToDeg (long DegCod)
    for (NumMyDeg = 0;
         NumMyDeg < Gbl.Usrs.Me.MyDegs.Num;
         NumMyDeg++)
-      if (Gbl.Usrs.Me.MyDegs.Degs[NumMyDeg].DegCod == DegCod)
+      if (Gbl.Usrs.Me.MyDegs.Degs[NumMyDeg].HieCod == DegCod)
          return true;
    return false;
   }
diff --git a/swad_degree.h b/swad_degree.h
index 8c25ee9f..f644271b 100644
--- a/swad_degree.h
+++ b/swad_degree.h
@@ -42,8 +42,6 @@
 
 #define Deg_MAX_YEARS_PER_DEGREE	12 // Max number of academic years per degree
 
-#define Deg_MAX_DEGREES_PER_USR		20 // Used in list of my degrees
-
 /*****************************************************************************/
 /***************************** Public prototypes *****************************/
 /*****************************************************************************/
diff --git a/swad_enrolment.c b/swad_enrolment.c
index 7b300061..9f33e78d 100644
--- a/swad_enrolment.c
+++ b/swad_enrolment.c
@@ -3248,27 +3248,33 @@ void Enr_GetMyCourses (void)
    Enr_DB_CreateTmpTableMyCourses ();
 
    /***** Get my courses from database *****/
+   Gbl.Usrs.Me.MyCrss.Num = 0;
+   Gbl.Usrs.Me.MyCrss.Crss = NULL;
+
    NumCrss = Enr_DB_GetMyCourses (&mysql_res);
-   for (NumCrs = 0;
-	NumCrs < NumCrss;
-	NumCrs++)
+   if (NumCrss)
      {
-      /* Get next course */
-      row = mysql_fetch_row (mysql_res);
-
-      /* Get course code (row[0]) */
-      if ((CrsCod = Str_ConvertStrCodToLongCod (row[0])) > 0)
+      if ((Gbl.Usrs.Me.MyCrss.Crss = malloc (NumCrss *
+					     sizeof (*Gbl.Usrs.Me.MyCrss.Crss))) == NULL)
+	 Err_NotEnoughMemoryExit ();
+      for (NumCrs = 0;
+	   NumCrs < NumCrss;
+	   NumCrs++)
 	{
-	 if (Gbl.Usrs.Me.MyCrss.Num == Crs_MAX_COURSES_PER_USR)
-	    Err_ShowErrorAndExit ("Maximum number of courses of a user exceeded.");
+	 /* Get next course */
+	 row = mysql_fetch_row (mysql_res);
 
-	 Gbl.Usrs.Me.MyCrss.Crss[Gbl.Usrs.Me.MyCrss.Num].CrsCod = CrsCod;
+	 /* Get course code (row[0]) */
+	 if ((CrsCod = Str_ConvertStrCodToLongCod (row[0])) > 0)
+	   {
+	    Gbl.Usrs.Me.MyCrss.Crss[Gbl.Usrs.Me.MyCrss.Num].HieCod = CrsCod;
 
-	 /* Get role (row[1]) and degree code (row[2]) */
-	 Gbl.Usrs.Me.MyCrss.Crss[Gbl.Usrs.Me.MyCrss.Num].Role   = Rol_ConvertUnsignedStrToRole (row[1]);
-	 Gbl.Usrs.Me.MyCrss.Crss[Gbl.Usrs.Me.MyCrss.Num].DegCod = Str_ConvertStrCodToLongCod (row[2]);
+	    /* Get role (row[1]) and degree code (row[2]) */
+	    Gbl.Usrs.Me.MyCrss.Crss[Gbl.Usrs.Me.MyCrss.Num].MaxRole = Rol_ConvertUnsignedStrToRole (row[1]);
+	    Gbl.Usrs.Me.MyCrss.Crss[Gbl.Usrs.Me.MyCrss.Num].PrtCod  = Str_ConvertStrCodToLongCod (row[2]);
 
-	 Gbl.Usrs.Me.MyCrss.Num++;
+	    Gbl.Usrs.Me.MyCrss.Num++;
+	   }
 	}
      }
 
@@ -3289,6 +3295,9 @@ void Enr_FreeMyCourses (void)
      {
       /***** Reset list *****/
       Gbl.Usrs.Me.MyCrss.Filled = false;
+      if (Gbl.Usrs.Me.MyCrss.Num &&
+	  Gbl.Usrs.Me.MyCrss.Crss)
+         free (Gbl.Usrs.Me.MyCrss.Crss);
       Gbl.Usrs.Me.MyCrss.Num    = 0;
 
       /***** Remove temporary table with my courses *****/
@@ -3311,7 +3320,7 @@ bool Enr_CheckIfIBelongToCrs (long CrsCod)
    for (NumMyCrs = 0;
         NumMyCrs < Gbl.Usrs.Me.MyCrss.Num;
         NumMyCrs++)
-      if (Gbl.Usrs.Me.MyCrss.Crss[NumMyCrs].CrsCod == CrsCod)
+      if (Gbl.Usrs.Me.MyCrss.Crss[NumMyCrs].HieCod == CrsCod)
          return true;
 
    return false;
diff --git a/swad_forum.c b/swad_forum.c
index cb0dccb1..98a15dc8 100644
--- a/swad_forum.c
+++ b/swad_forum.c
@@ -1317,7 +1317,7 @@ void For_ShowForumList (struct For_Forums *Forums)
 		    NumMyIns < Gbl.Usrs.Me.MyInss.Num;
 		    NumMyIns++)
 		 {
-		  InsCod = Gbl.Usrs.Me.MyInss.Inss[NumMyIns].InsCod;
+		  InsCod = Gbl.Usrs.Me.MyInss.Inss[NumMyIns].HieCod;
 
 		  /* Links to forums of this institution */
 		  For_WriteLinksToInsForums (Forums,
diff --git a/swad_global.h b/swad_global.h
index 9cdf4d97..24c5a14e 100644
--- a/swad_global.h
+++ b/swad_global.h
@@ -137,52 +137,31 @@ struct Globals
            {
             bool Filled;	// My institutions are already filled?
             unsigned Num;
-            struct
-              {
-               long CtyCod;
-               Rol_Role_t MaxRole;
-              } Ctys[Cty_MAX_COUNTRS_PER_USR];
+            struct Hie_MyNode *Ctys;
            } MyCtys;
          struct
            {
             bool Filled;	// My institutions are already filled?
             unsigned Num;
-            struct
-              {
-               long InsCod;
-               Rol_Role_t MaxRole;
-              } Inss[Ins_MAX_INSTITS_PER_USR];
+            struct Hie_MyNode *Inss;
            } MyInss;
          struct
            {
             bool Filled;	// My centers are already filled?
             unsigned Num;
-            struct
-              {
-               long CtrCod;
-               Rol_Role_t MaxRole;
-              } Ctrs[Ctr_MAX_CENTERS_PER_USR];
+            struct Hie_MyNode *Ctrs;
            } MyCtrs;
          struct
            {
             bool Filled;	// My degrees are already filled?
             unsigned Num;
-            struct
-              {
-               long DegCod;
-               Rol_Role_t MaxRole;
-              } Degs[Deg_MAX_DEGREES_PER_USR];
+            struct Hie_MyNode *Degs;
            } MyDegs;
          struct
            {
             bool Filled;	// My courses are already filled?
             unsigned Num;
-            struct
-              {
-               long CrsCod;
-               Rol_Role_t Role;
-               long DegCod;
-              } Crss[Crs_MAX_COURSES_PER_USR];
+            struct Hie_MyNode *Crss;
            } MyCrss;
 	 Set_ShowUsrsType_t ListType;	// My preference about user's list type
 	 unsigned NumFollowers;	// Number of users who follow me
diff --git a/swad_hierarchy_type.h b/swad_hierarchy_type.h
index 065c1e62..5cb4820f 100644
--- a/swad_hierarchy_type.h
+++ b/swad_hierarchy_type.h
@@ -28,6 +28,7 @@
 /*****************************************************************************/
 
 #include "swad_constant.h"
+#include "swad_role_type.h"
 #include "swad_string.h"
 
 /*****************************************************************************/
@@ -77,6 +78,13 @@ typedef enum
 #define Hie_MAX_CHARS_FULL_NAME	(128 - 1)	// 127
 #define Hie_MAX_BYTES_FULL_NAME	((Hie_MAX_CHARS_FULL_NAME + 1) * Str_MAX_BYTES_PER_CHAR - 1)	// 2047
 
+struct Hie_MyNode
+  {
+   long HieCod;			// Course/degree/center/institution/country code
+   long PrtCod;			// Parent code
+   Rol_Role_t MaxRole;		// Role in course or maximum role in degree/center/institution/country
+  };
+
 struct Hie_Node
   {
    long HieCod;			// Course/degree/center/institution/country code
diff --git a/swad_institution.c b/swad_institution.c
index c51a30b9..db93c438 100644
--- a/swad_institution.c
+++ b/swad_institution.c
@@ -1699,29 +1699,33 @@ void Ins_GetMyInstits (void)
    if (!Gbl.Usrs.Me.MyInss.Filled)
      {
       Gbl.Usrs.Me.MyInss.Num = 0;
+      Gbl.Usrs.Me.MyInss.Inss = NULL;
 
       /***** Get my institutions from database *****/
       NumInss = Ins_DB_GetInssFromUsr (&mysql_res,
                                        Gbl.Usrs.Me.UsrDat.UsrCod,-1L);
-      for (NumIns = 0;
-	   NumIns < NumInss;
-	   NumIns++)
-	{
-	 /* Get next institution */
-	 row = mysql_fetch_row (mysql_res);
-
-	 /* Get institution code */
-	 if ((InsCod = Str_ConvertStrCodToLongCod (row[0])) > 0)
+      if (NumInss)
+        {
+	 if ((Gbl.Usrs.Me.MyInss.Inss = malloc (NumInss *
+						sizeof (*Gbl.Usrs.Me.MyInss.Inss))) == NULL)
+            Err_NotEnoughMemoryExit ();
+	 for (NumIns = 0;
+	      NumIns < NumInss;
+	      NumIns++)
 	   {
-	    if (Gbl.Usrs.Me.MyInss.Num == Ins_MAX_INSTITS_PER_USR)
-	       Err_ShowErrorAndExit ("Maximum number of institutions of a user exceeded.");
+	    /* Get next institution */
+	    row = mysql_fetch_row (mysql_res);
 
-	    Gbl.Usrs.Me.MyInss.Inss[Gbl.Usrs.Me.MyInss.Num].InsCod  = InsCod;
-	    Gbl.Usrs.Me.MyInss.Inss[Gbl.Usrs.Me.MyInss.Num].MaxRole = Rol_ConvertUnsignedStrToRole (row[1]);
+	    /* Get institution code */
+	    if ((InsCod = Str_ConvertStrCodToLongCod (row[0])) > 0)
+	      {
+	       Gbl.Usrs.Me.MyInss.Inss[Gbl.Usrs.Me.MyInss.Num].HieCod  = InsCod;
+	       Gbl.Usrs.Me.MyInss.Inss[Gbl.Usrs.Me.MyInss.Num].MaxRole = Rol_ConvertUnsignedStrToRole (row[1]);
 
-	    Gbl.Usrs.Me.MyInss.Num++;
+	       Gbl.Usrs.Me.MyInss.Num++;
+	      }
 	   }
-	}
+        }
 
       /***** Free structure that stores the query result *****/
       DB_FreeMySQLResult (&mysql_res);
@@ -1741,7 +1745,11 @@ void Ins_FreeMyInstits (void)
      {
       /***** Reset list *****/
       Gbl.Usrs.Me.MyInss.Filled = false;
-      Gbl.Usrs.Me.MyInss.Num    = 0;
+      if (Gbl.Usrs.Me.MyInss.Num &&
+	  Gbl.Usrs.Me.MyInss.Inss)
+         free (Gbl.Usrs.Me.MyInss.Inss);
+      Gbl.Usrs.Me.MyInss.Inss = NULL;
+      Gbl.Usrs.Me.MyInss.Num = 0;
      }
   }
 
@@ -1760,7 +1768,7 @@ bool Ins_CheckIfIBelongToIns (long InsCod)
    for (NumMyIns = 0;
         NumMyIns < Gbl.Usrs.Me.MyInss.Num;
         NumMyIns++)
-      if (Gbl.Usrs.Me.MyInss.Inss[NumMyIns].InsCod == InsCod)
+      if (Gbl.Usrs.Me.MyInss.Inss[NumMyIns].HieCod == InsCod)
          return true;
    return false;
   }
diff --git a/swad_institution.h b/swad_institution.h
index 2fa14d50..c330e627 100644
--- a/swad_institution.h
+++ b/swad_institution.h
@@ -32,12 +32,6 @@
 #include "swad_figure_cache.h"
 #include "swad_role_type.h"
 
-/*****************************************************************************/
-/************************ Public types and constants *************************/
-/*****************************************************************************/
-
-#define Ins_MAX_INSTITS_PER_USR	 10	// Used in list of my institutions
-
 /*****************************************************************************/
 /***************************** Public prototypes *****************************/
 /*****************************************************************************/
diff --git a/swad_role.c b/swad_role.c
index e199b4e1..637a60d2 100644
--- a/swad_role.c
+++ b/swad_role.c
@@ -263,7 +263,7 @@ Rol_Role_t Rol_GetMyMaxRoleInIns (long InsCod)
       for (NumMyIns = 0;
            NumMyIns < Gbl.Usrs.Me.MyInss.Num;
            NumMyIns++)
-         if (Gbl.Usrs.Me.MyInss.Inss[NumMyIns].InsCod == InsCod)
+         if (Gbl.Usrs.Me.MyInss.Inss[NumMyIns].HieCod == InsCod)
             return Gbl.Usrs.Me.MyInss.Inss[NumMyIns].MaxRole;
       return Rol_GST;
      }
@@ -287,7 +287,7 @@ Rol_Role_t Rol_GetMyMaxRoleInCtr (long CtrCod)
       for (NumMyCtr = 0;
            NumMyCtr < Gbl.Usrs.Me.MyCtrs.Num;
            NumMyCtr++)
-         if (Gbl.Usrs.Me.MyCtrs.Ctrs[NumMyCtr].CtrCod == CtrCod)
+         if (Gbl.Usrs.Me.MyCtrs.Ctrs[NumMyCtr].HieCod == CtrCod)
             return Gbl.Usrs.Me.MyCtrs.Ctrs[NumMyCtr].MaxRole;
       return Rol_GST;
      }
@@ -313,7 +313,7 @@ Rol_Role_t Rol_GetMyMaxRoleInDeg (long DegCod)
    for (NumMyDeg = 0;
 	NumMyDeg < Gbl.Usrs.Me.MyDegs.Num;
 	NumMyDeg++)
-      if (Gbl.Usrs.Me.MyDegs.Degs[NumMyDeg].DegCod == DegCod)
+      if (Gbl.Usrs.Me.MyDegs.Degs[NumMyDeg].HieCod == DegCod)
 	 return Gbl.Usrs.Me.MyDegs.Degs[NumMyDeg].MaxRole;
    return Rol_GST;
   }
@@ -349,9 +349,9 @@ Rol_Role_t Rol_GetMyRoleInCrs (long CrsCod)
    for (NumMyCrs = 0, Role = Rol_UNK;
 	NumMyCrs < Gbl.Usrs.Me.MyCrss.Num;
 	NumMyCrs++)
-      if (Gbl.Usrs.Me.MyCrss.Crss[NumMyCrs].CrsCod == CrsCod)
+      if (Gbl.Usrs.Me.MyCrss.Crss[NumMyCrs].HieCod == CrsCod)
 	{
-	 Role = Gbl.Usrs.Me.MyCrss.Crss[NumMyCrs].Role;
+	 Role = Gbl.Usrs.Me.MyCrss.Crss[NumMyCrs].MaxRole;
 	 break;
 	}