Default Bootloop after flashing CM10/11

Hi,

I tried to flash CM10.2 (stable) by first flashing boot.img with fastboot and then flashing the zip from the recovery. When that didn't work I tried to flash different versions of CM10/11, both from get.cm and from FXP. I have an unlocked bootloader and ran stock Android 4.2 before. Is there any known issues that I might've missed?