I have noticed this when i was modifying sample for my own needs. Problem appears to be only with IE8, Chrome works with no issues. Here is the problem, it actually repeatable in demo download also. When i load events from database and click on event it is using js to open modal window with event details at this point everything looks ok. Once i move event lets say to a new time slot or another resource and open modal window in some cases it shows original values in some cases it shows new values, however, if i move/modify event again modal window shows wrong values even though data is actually correct (bubble shows correct new data). It does not appear that page_load is even called in these cases