Android keyboard stopped working I did a revert from CM10.1 to CM10. 

Now, my keyboard is broken. It does not stop crashing. I tried everything: 


Clearing data and cache
restart of the app
factory reset
clearing dalvik and normal cache
re-installing it several times with different gapps, although I know the correct match. 


Now, I'm back to cm-10.0.0-maguro and gapps-jb-20121011-signed. Meanwhile, I'm thinking of a system wipe using CWM recovery. Is this safe, or will it brick my phone? Is there anything I need to know?
I finally made it without a /system/-wipe. I reinstalled CM9.1 + gapps, ran it once, and installed CM10 + gapps. Now it works fine! Anyway thanks for your help!