I've worked with it last night, also using Win7x64, so far found that after 2-3 hours its just needs to be closed and re-opened (if you clicking but nothing opens, its time to restart CK). But last night I've left something in the Filter/All, and now when I start CK the same window pops up, but before I could select File/Data it just crashes. Is there any backup or local memory for CK that we can delete? I reinstalled, but still the same windows coming up. I'm thinking about to uninstall, delete everything that left, restart pc and re-install CK...