I store a lot of data in game attributes. A lot of it is in lists and are not of types that can be saved/loaded but these are not the issue as they are reset on game start.
The issue is that when reloading the game some attributes are sometimes not loaded properly. My testers are getting impatient when their hard work sometimes is lost after restarting the browser

Anyone having the same problem?
Is there a limit as to how much data you can store in game attributes when saving? Is it a problem that I store other types in game attributes? Could there be a concurrency problem here somehow due to the large amount of data (maybe about 100 attributes, half of these in lists)? Or am I more likely to have screwed something up somewhere else? (I'm not a beginner programmer though, not that I don't screw thing up now and then, just thought it should be mentioned)
You can test the game here if you want:
stencyl.com/game/play/23286