Index: lams_monitoring/web/includes/javascript/monitorLesson.js
===================================================================
diff -u -r9aabce20ab39a7639b3ab35a2a9e4dc20cbf4ac3 -r3492335e25f6808d7055e0821b38c91ef9e2550c
--- lams_monitoring/web/includes/javascript/monitorLesson.js	(.../monitorLesson.js)	(revision 9aabce20ab39a7639b3ab35a2a9e4dc20cbf4ac3)
+++ lams_monitoring/web/includes/javascript/monitorLesson.js	(.../monitorLesson.js)	(revision 3492335e25f6808d7055e0821b38c91ef9e2550c)
@@ -121,7 +121,7 @@
 					$('#imAvailableField').attr({
 						'checked'  : null,
 						'disabled' : 'disabled'
-					});
+					}).change();
 					alert(LABELS.LESSON_PRESENCE_DISABLE_ALERT);
 				}
 			}