Index: lams_central/src/flash/org/lamsfoundation/lams/learner/ls/LessonView.as
===================================================================
diff -u -r8289a46f20448b6d1c98af0a1fdba50787661a30 -r52d772959dc9354d48715551645fdd3dd0327f5b
--- lams_central/src/flash/org/lamsfoundation/lams/learner/ls/LessonView.as	(.../LessonView.as)	(revision 8289a46f20448b6d1c98af0a1fdba50787661a30)
+++ lams_central/src/flash/org/lamsfoundation/lams/learner/ls/LessonView.as	(.../LessonView.as)	(revision 52d772959dc9354d48715551645fdd3dd0327f5b)
@@ -306,8 +306,9 @@
 					targetPos = progress_scp.vScroller.minPos;
 				}
 				
-				ScrollCheckIntervalID = setInterval(Proxy.create(this,adjustScrollBar,targetPos),SCROLL_CHECK_INTERVAL);
-				
+				if(progress_scp.vScroller._visible) {
+					ScrollCheckIntervalID = setInterval(Proxy.create(this,adjustScrollBar,targetPos),SCROLL_CHECK_INTERVAL);
+				}
 			}
 		
 		} else {
Index: lams_learning/web/lams_learner.swf
===================================================================
diff -u -r8289a46f20448b6d1c98af0a1fdba50787661a30 -r52d772959dc9354d48715551645fdd3dd0327f5b
Binary files differ