Index: lams_central/web/includes/javascript/authoring/authoringActivity.js
===================================================================
diff -u -ref32c5d5a859467fe2a98b31251041d4e0c0582c -ree9151268fa918fe7122d89811f87f6943256dea
--- lams_central/web/includes/javascript/authoring/authoringActivity.js	(.../authoringActivity.js)	(revision ef32c5d5a859467fe2a98b31251041d4e0c0582c)
+++ lams_central/web/includes/javascript/authoring/authoringActivity.js	(.../authoringActivity.js)	(revision ee9151268fa918fe7122d89811f87f6943256dea)
@@ -1288,6 +1288,9 @@
 	},
 		
 	adjustTransitionPoint : function(bottomLimit, topLimit, target) {
+		bottomLimit = Math.round(bottomLimit);
+		topLimit = Math.round(topLimit);
+		target = Math.round(target);
 		// find a good point inside the grid, then make sure it is within bounds
 		return Math.max(bottomLimit + layout.transition.adjustStep, Math.min(topLimit - layout.transition.adjustStep,
 				Math.floor(target / layout.transition.adjustStep) * layout.transition.adjustStep));