diff --git a/swad_attendance.c b/swad_attendance.c
index 0f8e2fbb4..64c36cb44 100644
--- a/swad_attendance.c
+++ b/swad_attendance.c
@@ -3519,7 +3519,7 @@ static void Att_ListAttEventsForAStd (unsigned NumUsr,struct UsrData *UsrDat)
 
    /***** Write user's ID ******/
    Tbl_TD_Begin ("class=\"LEFT_MIDDLE COLOR%u\"",Gbl.RowEvenOdd);
-   Tbl_TABLE_BeginWithoutAttr ();
+   Tbl_TABLE_Begin (NULL);
    Tbl_TR_Begin (NULL);
 
    Tbl_TD_Begin ("class=\"%s LEFT_MIDDLE\"",
diff --git a/swad_changelog.h b/swad_changelog.h
index 7fb56a7a7..f73d44ee1 100644
--- a/swad_changelog.h
+++ b/swad_changelog.h
@@ -487,7 +487,7 @@ enscript -2 --landscape --color --file-align=2 --highlight --line-numbers -o - *
 En OpenSWAD:
 ps2pdf source.ps destination.pdf
 */
-#define Log_PLATFORM_VERSION	"SWAD 19.33.7 (2019-10-13)"
+#define Log_PLATFORM_VERSION	"SWAD 19.33.8 (2019-10-13)"
 #define CSS_FILE		"swad19.33.css"
 #define JS_FILE			"swad19.30.js"
 /*
@@ -496,6 +496,7 @@ ps2pdf source.ps destination.pdf
 // TODO: En un TFG no preasignado con estudiante tiene que salir un triángulo amarillo
 // TODO: Hacer un nuevo rol en los TFG: tutor externo (profesor de áreas no vinculadas con el centro, profesionales de empresas, etc.)
 
+	Version 19.33.8:  Oct 13, 2019	Fixed bug in tables. (245339 lines)
 	Version 19.33.7:  Oct 13, 2019	Fixed bug in surveys. (245317 lines)
 	Version 19.33.6:  Oct 13, 2019	Fixed bug in exam announcements. (245299 lines)
 	Version 19.33.5:  Oct 13, 2019	Fixed bug in file browser. (245298 lines)
diff --git a/swad_date.c b/swad_date.c
index 4b4005745..b9af96465 100644
--- a/swad_date.c
+++ b/swad_date.c
@@ -557,7 +557,7 @@ void Dat_WriteFormClientLocalDateTimeFromTimeUTC (const char *Id,
 
 
    /***** Start table *****/
-   Tbl_TABLE_BeginWithoutAttr ();
+   Tbl_TABLE_Begin (NULL);
    Tbl_TR_Begin (NULL);
 
    /***** Year *****/
@@ -824,7 +824,7 @@ void Dat_WriteFormDate (unsigned FirstYear,unsigned LastYear,
    unsigned NumDaysSelectedMonth;
 
    /***** Start table *****/
-   Tbl_TABLE_BeginWithoutAttr ();
+   Tbl_TABLE_Begin (NULL);
    Tbl_TR_Begin (NULL);
 
    /***** Year *****/
diff --git a/swad_degree.c b/swad_degree.c
index d16cac002..6d2e88580 100644
--- a/swad_degree.c
+++ b/swad_degree.c
@@ -2510,8 +2510,8 @@ void Hie_GetAndWriteInsCtrDegAdminBy (long UsrCod,unsigned ColSpan)
          Tbl_TD_End ();
 
          /***** Write institution, centre, degree *****/
-         Tbl_TD_Begin ("colspan=\"%u\" class=\"DAT_SMALL_NOBR LEFT_TOP COLOR%u\">",
-                            ColSpan - 1,Gbl.RowEvenOdd);
+         Tbl_TD_Begin ("colspan=\"%u\" class=\"DAT_SMALL_NOBR LEFT_TOP COLOR%u\"",
+                       ColSpan - 1,Gbl.RowEvenOdd);
 
          /* Get next institution, centre, degree */
          row = mysql_fetch_row (mysql_res);
diff --git a/swad_file_browser.c b/swad_file_browser.c
index 0066c0909..3232a4f7d 100644
--- a/swad_file_browser.c
+++ b/swad_file_browser.c
@@ -5596,7 +5596,7 @@ static bool Brw_WriteRowFileBrowser (unsigned Level,const char *RowId,
    /* Start column */
    Tbl_TD_Begin ("class=\"NO_BR LEFT_TOP COLOR%u\" style=\"width:99%%;\"",Gbl.RowEvenOdd);
 
-   Tbl_TABLE_BeginWithoutAttr ();
+   Tbl_TABLE_Begin (NULL);
    Tbl_TR_Begin (NULL);
 
    /* Indent depending on level */
@@ -5824,7 +5824,7 @@ static void Brw_IndentAndWriteIconExpandContract (unsigned Level,
                                                   Brw_IconTree_t IconThisRow)
   {
    Tbl_TD_Begin ("class=\"LEFT_MIDDLE\"");
-   Tbl_TABLE_BeginWithoutAttr ();
+   Tbl_TABLE_Begin (NULL);
    Tbl_TR_Begin (NULL);
    Brw_IndentDependingOnLevel (Level);
 
@@ -8512,7 +8512,7 @@ static void Brw_PutFormToCreateALink (const char *FileNameToShow)
 	          FileNameToShow);
 
    /***** URL *****/
-   Tbl_TABLE_BeginWithoutAttr ();
+   Tbl_TABLE_Begin (NULL);
    Tbl_TR_Begin (NULL);
 
    Tbl_TD_Begin ("class=\"RIGHT_MIDDLE\"");
diff --git a/swad_follow.c b/swad_follow.c
index 0f4f0db12..d6fbe1983 100644
--- a/swad_follow.c
+++ b/swad_follow.c
@@ -217,7 +217,7 @@ void Fol_SuggestUsrsToFollowMainZoneOnRightColumn (void)
       Frm_EndForm ();
 
       /***** Start table *****/
-      Tbl_TABLE_BeginWithoutAttr ();
+      Tbl_TABLE_Begin (NULL);
 
       /***** Initialize structure with user's data *****/
       Usr_UsrDataConstructor (&UsrDat);
diff --git a/swad_layout.c b/swad_layout.c
index 47adc5eeb..8066f13e6 100644
--- a/swad_layout.c
+++ b/swad_layout.c
@@ -1616,11 +1616,11 @@ void Lay_WriteHeaderClassPhoto (bool PrintView,bool DrawingClassPhoto,
    Crs_GetDataOfCourseByCod (&Crs);
 
    /***** Start table *****/
-   fprintf (Gbl.F.Out,"<table style=\"width:100%%; padding:12px;\">");	// TODO: Change inline style to class
+   Tbl_TABLE_BeginWidePadding (10);
    Tbl_TR_Begin (NULL);
 
    /***** First column: institution logo *****/
-   Tbl_TD_Begin ("class=\"LEFT_TOP\" style=\"width:80px;\"");
+   Tbl_TD_Begin ("class=\"LEFT_TOP\" style=\"width:60px;\"");
    if (InsCod > 0)
      {
       if (!PrintView)
@@ -1668,7 +1668,7 @@ void Lay_WriteHeaderClassPhoto (bool PrintView,bool DrawingClassPhoto,
    Tbl_TD_End ();
 
    /***** Third column: degree logo *****/
-   Tbl_TD_Begin ("class=\"RIGHT_TOP\" style=\"width:80px;\"");
+   Tbl_TD_Begin ("class=\"RIGHT_TOP\" style=\"width:60px;\"");
    if (DegCod > 0)
      {
       if (!PrintView)
diff --git a/swad_message.c b/swad_message.c
index 3780eb2e0..cc742ca63 100644
--- a/swad_message.c
+++ b/swad_message.c
@@ -3363,7 +3363,7 @@ static void Msg_WriteMsgFrom (struct UsrData *UsrDat,bool Deleted)
    bool ShowPhoto;
    char PhotoURL[PATH_MAX + 1];
 
-   Tbl_TABLE_BeginWithoutAttr ();
+   Tbl_TABLE_Begin (NULL);
    Tbl_TR_Begin (NULL);
 
    /***** Put an icon to show if user has read the message *****/
@@ -3492,7 +3492,7 @@ static void Msg_WriteMsgTo (long MsgCod)
    if (NumRecipientsTotal)
      {
       /***** Start table *****/
-      Tbl_TABLE_BeginWithoutAttr ();
+      Tbl_TABLE_Begin (NULL);
 
       /***** How many recipients will be shown? *****/
       if (NumRecipientsKnown <= Msg_MAX_RECIPIENTS_TO_SHOW)
diff --git a/swad_profile.c b/swad_profile.c
index 242e99cf0..3d08a860f 100644
--- a/swad_profile.c
+++ b/swad_profile.c
@@ -1538,7 +1538,7 @@ void Prf_ShowRankingFigure (MYSQL_RES **mysql_res,unsigned NumUsrs)
       /***** Initialize structure with user's data *****/
       Usr_UsrDataConstructor (&UsrDat);
 
-      Tbl_TABLE_BeginWithoutAttr ();
+      Tbl_TABLE_Begin (NULL);
 
       for (NumUsr = 1, Rank = 1, Gbl.RowEvenOdd = 0;
 	   NumUsr <= NumUsrs;
@@ -1707,7 +1707,7 @@ void Prf_GetAndShowRankingClicksPerDay (void)
       /***** Initialize structure with user's data *****/
       Usr_UsrDataConstructor (&UsrDat);
 
-      Tbl_TABLE_BeginWithoutAttr ();
+      Tbl_TABLE_Begin (NULL);
 
       for (NumUsr = 1, Rank = 1, Gbl.RowEvenOdd = 0;
 	   NumUsr <= NumUsrs;
diff --git a/swad_statistic.c b/swad_statistic.c
index b9dd89594..5557b97d1 100644
--- a/swad_statistic.c
+++ b/swad_statistic.c
@@ -383,7 +383,7 @@ void Sta_AskShowCrsHits (void)
          Tbl_TD_End ();
 
 	 Tbl_TD_Begin ("colspan=\"2\" class=\"%s LEFT_TOP\"",The_ClassFormInBox[Gbl.Prefs.Theme]);
-         Tbl_TABLE_BeginWithoutAttr ();
+         Tbl_TABLE_Begin (NULL);
          Usr_ListUsersToSelect (Rol_TCH);
          Usr_ListUsersToSelect (Rol_NET);
          Usr_ListUsersToSelect (Rol_STD);
diff --git a/swad_table.c b/swad_table.c
index d61043471..99e37b302 100644
--- a/swad_table.c
+++ b/swad_table.c
@@ -55,6 +55,7 @@ extern struct Globals Gbl;
 /***************************** Private vatiables *****************************/
 /*****************************************************************************/
 
+static unsigned Tbl_TABLE_NestingLevel = 0;
 static unsigned Tbl_TR_NestingLevel = 0;
 static unsigned Tbl_TH_NestingLevel = 0;
 static unsigned Tbl_TD_NestingLevel = 0;
@@ -63,10 +64,13 @@ static unsigned Tbl_TD_NestingLevel = 0;
 /***************************** Private prototypes ****************************/
 /*****************************************************************************/
 
-static void Tbl_TR_BeginWithoutAttr (void);
-static void Tbl_TH_BeginWithoutAttr (void);
+static void Tbl_TABLE_BeginWithoutAttr (void);
 
+static void Tbl_TR_BeginWithoutAttr (void);
+
+static void Tbl_TH_BeginWithoutAttr (void);
 static void Tbl_TH_BeginAttr (const char *fmt,...);
+
 static void Tbl_TD_BeginWithoutAttr (void);
 
 /*****************************************************************************/
@@ -95,6 +99,8 @@ void Tbl_TABLE_Begin (const char *fmt,...)
 	 /***** Print HTML *****/
 	 fprintf (Gbl.F.Out,"<table class=\"%s\">",Class);
 
+	 Tbl_TABLE_NestingLevel++;
+
 	 free ((void *) Class);
 	}
       else
@@ -107,22 +113,32 @@ void Tbl_TABLE_Begin (const char *fmt,...)
 void Tbl_TABLE_BeginPadding (unsigned CellPadding)
   {
    if (CellPadding)
+     {
       fprintf (Gbl.F.Out,"<table class=\"CELLS_PAD_%u\">",
 	       CellPadding);	// CellPadding must be 0, 1, 2, 5 or 10
+
+      Tbl_TABLE_NestingLevel++;
+     }
    else
       Tbl_TABLE_BeginWithoutAttr ();
   }
 
-void Tbl_TABLE_BeginWithoutAttr (void)
+static void Tbl_TABLE_BeginWithoutAttr (void)
   {
    fprintf (Gbl.F.Out,"<table>");
+
+   Tbl_TABLE_NestingLevel++;
   }
 
 void Tbl_TABLE_BeginCenterPadding (unsigned CellPadding)
   {
    if (CellPadding)
+     {
       fprintf (Gbl.F.Out,"<table class=\"FRAME_TBL_CENTER CELLS_PAD_%u\">",
 	       CellPadding);	// CellPadding must be 0, 1, 2, 5 or 10
+
+      Tbl_TABLE_NestingLevel++;
+     }
    else
       Tbl_TABLE_BeginCenter ();
   }
@@ -130,13 +146,19 @@ void Tbl_TABLE_BeginCenterPadding (unsigned CellPadding)
 void Tbl_TABLE_BeginCenter (void)
   {
    fprintf (Gbl.F.Out,"<table class=\"FRAME_TBL_CENTER\">");
+
+   Tbl_TABLE_NestingLevel++;
   }
 
 void Tbl_TABLE_BeginWidePadding (unsigned CellPadding)
   {
    if (CellPadding)
+     {
       fprintf (Gbl.F.Out,"<table class=\"FRAME_TBL_WIDE CELLS_PAD_%u\">",
 	       CellPadding);	// CellPadding must be 0, 1, 2, 5 or 10
+
+      Tbl_TABLE_NestingLevel++;
+     }
    else
       Tbl_TABLE_BeginWide ();
   }
@@ -144,13 +166,19 @@ void Tbl_TABLE_BeginWidePadding (unsigned CellPadding)
 void Tbl_TABLE_BeginWide (void)
   {
    fprintf (Gbl.F.Out,"<table class=\"FRAME_TBL_WIDE\">");
+
+   Tbl_TABLE_NestingLevel++;
   }
 
 void Tbl_TABLE_BeginWideMarginPadding (unsigned CellPadding)
   {
    if (CellPadding)
+     {
       fprintf (Gbl.F.Out,"<table class=\"FRAME_TBL_WIDE_MARGIN CELLS_PAD_%u\">",
 	       CellPadding);	// CellPadding must be 0, 1, 2, 5 or 10
+
+      Tbl_TABLE_NestingLevel++;
+     }
    else
       Tbl_TABLE_BeginWideMargin ();
   }
@@ -158,11 +186,18 @@ void Tbl_TABLE_BeginWideMarginPadding (unsigned CellPadding)
 void Tbl_TABLE_BeginWideMargin (void)
   {
    fprintf (Gbl.F.Out,"<table class=\"FRAME_TBL_WIDE_MARGIN\">");
+
+   Tbl_TABLE_NestingLevel++;
   }
 
 void Tbl_TABLE_End (void)
   {
+   if (Tbl_TABLE_NestingLevel == 0)	// No TABLE open
+      Ale_ShowAlert (Ale_ERROR,"Trying to close unopened TABLE.");
+
    fprintf (Gbl.F.Out,"</table>");
+
+   Tbl_TABLE_NestingLevel--;
   }
 
 /*****************************************************************************/
@@ -210,7 +245,7 @@ static void Tbl_TR_BeginWithoutAttr (void)
 void Tbl_TR_End (void)
   {
    if (Tbl_TR_NestingLevel == 0)	// No TR open
-      Lay_ShowErrorAndExit ("Trying to close unopened TR.");
+      Ale_ShowAlert (Ale_ERROR,"Trying to close unopened TR.");
 
    fprintf (Gbl.F.Out,"</tr>");
 
@@ -310,7 +345,7 @@ static void Tbl_TH_BeginWithoutAttr (void)
 void Tbl_TH_End (void)
   {
    if (Tbl_TH_NestingLevel == 0)	// No TH open
-      Lay_ShowErrorAndExit ("Trying to close unopened TR.");
+      Ale_ShowAlert (Ale_ERROR,"Trying to close unopened TR.");
 
    fprintf (Gbl.F.Out,"</th>");
 
@@ -375,7 +410,7 @@ static void Tbl_TD_BeginWithoutAttr (void)
 void Tbl_TD_End (void)
   {
    if (Tbl_TD_NestingLevel == 0)	// No TH open
-      Lay_ShowErrorAndExit ("Trying to close unopened TR.");
+      Ale_ShowAlert (Ale_ERROR,"Trying to close unopened TR.");
 
    fprintf (Gbl.F.Out,"</td>");
 
diff --git a/swad_table.h b/swad_table.h
index c4727fc2c..93ebe230b 100644
--- a/swad_table.h
+++ b/swad_table.h
@@ -41,7 +41,6 @@
 
 void Tbl_TABLE_Begin (const char *fmt,...);
 void Tbl_TABLE_BeginPadding (unsigned CellPadding);
-void Tbl_TABLE_BeginWithoutAttr (void);
 void Tbl_TABLE_BeginCenterPadding (unsigned CellPadding);
 void Tbl_TABLE_BeginCenter (void);
 void Tbl_TABLE_BeginWidePadding (unsigned CellPadding);
diff --git a/swad_test_import.c b/swad_test_import.c
index 1a7d3da01..d3eadb274 100644
--- a/swad_test_import.c
+++ b/swad_test_import.c
@@ -1031,7 +1031,7 @@ static void TsI_WriteRowImportedQst (struct XMLElement *StemElem,
    if (Gbl.Test.Tags.Num)
      {
       /***** Write the tags *****/
-      Tbl_TABLE_BeginWithoutAttr ();
+      Tbl_TABLE_Begin (NULL);
       for (NumTag = 0;
 	   NumTag < Gbl.Test.Tags.Num;
 	   NumTag++)
@@ -1099,7 +1099,7 @@ static void TsI_WriteRowImportedQst (struct XMLElement *StemElem,
       case Tst_ANS_UNIQUE_CHOICE:
       case Tst_ANS_MULTIPLE_CHOICE:
       case Tst_ANS_TEXT:
-         Tbl_TABLE_BeginWithoutAttr ();
+         Tbl_TABLE_Begin (NULL);
          for (NumOpt = 0;
               NumOpt < Gbl.Test.Answer.NumOptions;
               NumOpt++)
diff --git a/swad_timetable.c b/swad_timetable.c
index f48ac7439..4e4b4e443 100644
--- a/swad_timetable.c
+++ b/swad_timetable.c
@@ -1126,7 +1126,7 @@ static void TT_DrawTimeTable (void)
    unsigned ContinuousFreeMinicolumns;
 
    /***** Start table *****/
-   fprintf (Gbl.F.Out,"<table id=\"timetable\">");
+   Tbl_TABLE_Begin ("id=\"timetable\"");
 
    /***** Top row used for column adjustement *****/
    TT_TimeTableDrawAdjustRow ();
diff --git a/swad_user.c b/swad_user.c
index ba672e3fc..b68b46ef4 100644
--- a/swad_user.c
+++ b/swad_user.c
@@ -7374,7 +7374,7 @@ void Usr_ListDataAdms (void)
       fprintf (Gbl.F.Out,"</div>");
 
       /***** Heading row with column names *****/
-      Tbl_TABLE_BeginWithoutAttr ();
+      Tbl_TABLE_Begin (NULL);
       Tbl_TR_Begin (NULL);
 
       for (NumCol = 0;