Originally Posted by serio22
No it's not those.. It consists of Google back up, sync, play store, and other things, but I think it'll be better to just wipe the system, reflash ROM, and then flash kk gapps.. You should be up and running by then
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This. Anytime you are moving to a new base (in this case Android 4.3 to Android 4.4) your best option is to do a full wipe and fresh install. You can backup and restore your app data to the new version, just not your system settings.
The CM installer tried to outsmart this but if it doesn't work perfectly, just do a full wipe and fresh flash.
However, if you want to try flashing a KK Gapps package, I'm sure it won't brick your phone. So it's worth a shot to see if that fixes it. It will only waste 30 seconds of your time if it doesn't.