Index: lams_central/web/includes/javascript/addLesson.js
===================================================================
diff -u -rf14dd6ce1f03d0ce6d3914ea1d009cee059cc41b -rae05b164c9f505d387c1e49c02a36c4e92861150
--- lams_central/web/includes/javascript/addLesson.js	(.../addLesson.js)	(revision f14dd6ce1f03d0ce6d3914ea1d009cee059cc41b)
+++ lams_central/web/includes/javascript/addLesson.js	(.../addLesson.js)	(revision ae05b164c9f505d387c1e49c02a36c4e92861150)
@@ -375,6 +375,8 @@
 		}
 	}
 	
+	$('#addButton').button('loading');
+	
 	if ($('#splitLearnersField').is(':checked')) {
 		var maxLearnerCount = $('#selected-learners div.draggableItem').length,
 			learnerCount = $('#splitLearnersCountField').val(),