I've also started facing the same error for my game - it works fine in Firefox, and used to work in Chrome, but does not anymore:
I've tried all the suggested workarounds:
* Have added exceptions for Kongregate to allow cookies
* Have set local storage to on in Chrome settings
* Tried disabling acceleration
* Also tried it in incognito mode
But nothing seems to work. Did something break in the recent versions of Chrome!? Please help.
The game otherwise works fine on all platforms, including Android, Amazon and iOS (through CocoonJS).