Index: lams_central/src/flash/org/lamsfoundation/lams/authoring/cv/CanvasModel.as
===================================================================
diff -u -r7225d2f138a786e3464313d05d3d041d2c010eb3 -r82b546cf91482c0c8bf5e13848b4be1f094c8501
--- lams_central/src/flash/org/lamsfoundation/lams/authoring/cv/CanvasModel.as	(.../CanvasModel.as)	(revision 7225d2f138a786e3464313d05d3d041d2c010eb3)
+++ lams_central/src/flash/org/lamsfoundation/lams/authoring/cv/CanvasModel.as	(.../CanvasModel.as)	(revision 82b546cf91482c0c8bf5e13848b4be1f094c8501)
@@ -398,7 +398,7 @@
 	public function addActivityToTransition(ca:Object):Object{
 		var activity:Activity;
 		//check we have not added too many
-		if(ca instanceof CanvasActivity){
+		if(ca instanceof CanvasActivity || ca instanceof CanvasParallelActivity || ca instanceof CanvasOptionalActivity){
 			activity = ca.activity;
 		}else if(ca instanceof Activity){
 			activity = Activity(ca);