Index: lams_central/src/java/org/lamsfoundation/lams/authoring/ObjectExtractor.java
===================================================================
diff -u -rf3de7ac12162d8c33e8de55c3ca868b05600b7d4 -r0a14356a02bd1eafd448340a569b0504c09264fb
--- lams_central/src/java/org/lamsfoundation/lams/authoring/ObjectExtractor.java	(.../ObjectExtractor.java)	(revision f3de7ac12162d8c33e8de55c3ca868b05600b7d4)
+++ lams_central/src/java/org/lamsfoundation/lams/authoring/ObjectExtractor.java	(.../ObjectExtractor.java)	(revision 0a14356a02bd1eafd448340a569b0504c09264fb)
@@ -1931,7 +1931,7 @@
     }
 
     private Integer getCoord(JSONObject details, String tag) throws JSONException {
-	Integer coord = (Integer) JsonUtil.opt(details, tag);
+	Integer coord = ((Number) JsonUtil.opt(details, tag)).intValue();
 	return (coord == null) || (coord >= 0) ? coord : ObjectExtractor.DEFAULT_COORD;
     }
 
Index: lams_central/web/includes/javascript/authoring/authoringActivity.js
===================================================================
diff -u -r95ad3400767c4353eb510ce059e15e85df069c32 -r0a14356a02bd1eafd448340a569b0504c09264fb
--- lams_central/web/includes/javascript/authoring/authoringActivity.js	(.../authoringActivity.js)	(revision 95ad3400767c4353eb510ce059e15e85df069c32)
+++ lams_central/web/includes/javascript/authoring/authoringActivity.js	(.../authoringActivity.js)	(revision 0a14356a02bd1eafd448340a569b0504c09264fb)
@@ -463,11 +463,13 @@
 	 * Draws a Parallel (double) Activity container
 	 */
 	parallelActivity : function(x, y) {
-		if (x == undefined || y == undefined) {
-			// if no new coordinates are given, just redraw the activity
-			x = this.items.shape.getBBox().x;
-			y = this.items.shape.getBBox().y;
+		// if no new coordinates are given, just redraw the activity or give default value
+		if (x == undefined) {
+			x = this.items ? this.items.shape.getBBox().x : 0;
 		}
+		if (y == undefined) {
+			y = this.items ? this.items.shape.getBBox().y : 0;
+		}
 		
 		if (this.childActivities && this.childActivities.length > 0) {
 			// draw one by one, vertically
@@ -1484,4 +1486,4 @@
 		
 		branchingActivity.longestBranchLength = longestBranchLength;
 	}
-};
+};
\ No newline at end of file