Maybe a bad download? Or wrong recovery?
Anyway my bug with slimkat are keyboard that FC like happened also with cm10.2 to me (not with cm10.1, cm11 and now with mokee), back and menu buttons sometimes doesn't work, only home work (this is strange and happened only with slimkat) and the last annoying bug i found was missing browser's bookmarks sync, it miss in google account in settings! I had this bug with slimkat and now with mokee but not with cm11 and i used the same gapps.
I already wrote my bugs here but nobody care! Even developers that don't write a post since days!
With cm11 i had only some random reboot but rarely compared to cm10.2!
I don't know if someone else has my bug, but seems that every device has its own bugs! :P
Mine has problem also with fusionx...!