diff --git a/swad_changelog.h b/swad_changelog.h
index 770ac59f4..a04a66dbf 100644
--- a/swad_changelog.h
+++ b/swad_changelog.h
@@ -223,13 +223,14 @@
 /****************************** Public constants *****************************/
 /*****************************************************************************/
 
-#define Log_PLATFORM_VERSION	"SWAD 16.195.6 (2017-04-29)"
+#define Log_PLATFORM_VERSION	"SWAD 16.195.7 (2017-04-29)"
 #define CSS_FILE		"swad16.193.4.css"
 #define JS_FILE			"swad16.181.js"
 
 // Number of lines (includes comments but not blank lines) has been got with the following command:
 // nl swad*.c swad*.h css/swad*.css py/swad*.py js/swad*.js soap/swad*?.h sql/swad*.sql | tail -1
 /*
+        Version 16.195.7: Apr 29, 2017	Fixed bug in tabs. (218511 lines)
         Version 16.195.6: Apr 29, 2017	Code refactoring in edition of groups. (218507 lines)
         Version 16.195.5: Apr 29, 2017	Changes in layout of edition of groups. (218513 lines)
         Version 16.195.4: Apr 29, 2017	Changes in layout of edition of groups. (218513 lines)
diff --git a/swad_tab.c b/swad_tab.c
index b6ff62f0e..46fdff2b1 100644
--- a/swad_tab.c
+++ b/swad_tab.c
@@ -171,23 +171,26 @@ static bool Tab_CheckIfICanViewTab (Tab_Tab_t Tab)
       case TabUnk:
 	 return false;
       case TabSys:
-	 return (Gbl.CurrentCty.Cty.CtyCod <= 0);
+	 return (Gbl.CurrentCty.Cty.CtyCod <= 0);	// No country selected
       case TabCty:
-	 return (Gbl.CurrentCty.Cty.CtyCod > 0 &&
-	         Gbl.CurrentIns.Ins.InsCod <= 0);
+	 return (Gbl.CurrentCty.Cty.CtyCod > 0 &&	// Country selected
+	         Gbl.CurrentIns.Ins.InsCod <= 0);	// No institution selected
       case TabIns:
-	 return (Gbl.CurrentIns.Ins.InsCod > 0 &&
-	         Gbl.CurrentCtr.Ctr.CtrCod <= 0);
+	 return (Gbl.CurrentIns.Ins.InsCod > 0 &&	// Institution selected
+	         Gbl.CurrentCtr.Ctr.CtrCod <= 0);	// No centre selected
       case TabCtr:
-	 return (Gbl.CurrentCtr.Ctr.CtrCod > 0 &&
-	         Gbl.CurrentDeg.Deg.DegCod <= 0);
+	 return (Gbl.CurrentCtr.Ctr.CtrCod > 0 &&	// Centre selected
+	         Gbl.CurrentDeg.Deg.DegCod <= 0);	// No degree selected
       case TabDeg:
-	 return (Gbl.CurrentDeg.Deg.DegCod > 0 &&
-	         Gbl.CurrentCrs.Crs.CrsCod <= 0);
+	 return (Gbl.CurrentDeg.Deg.DegCod > 0 &&	// Degree selected
+	         Gbl.CurrentCrs.Crs.CrsCod <= 0);	// No course selected
       case TabCrs:
-	 return (Gbl.CurrentCrs.Crs.CrsCod > 0);
+	 return (Gbl.CurrentCrs.Crs.CrsCod > 0);	// Course selected
+      case TabAss:
+	 return (Gbl.CurrentCrs.Crs.CrsCod > 0 ||	// Course selected
+	         Gbl.Usrs.Me.LoggedRole >= Rol_STUDENT);// Surveys not available for unknown users and guests
       case TabFil:
-	 return (Gbl.CurrentIns.Ins.InsCod > 0);
+	 return (Gbl.CurrentIns.Ins.InsCod > 0);	// Institution selected
       default:
 	 return true;
      }