Did you wipe prior to installation? If not, then perhaps this is your problem, try wiping data and cache in recovery and see if that corrects your problem. If you did wipe, did you restore things, like maybe with something like Titanium Backup?
Are you running any other mods or themes?
Perhaps there was a problem with the download, did you check the md5 of AOKP38 and gapps?
I am just trying to guess things that possibly could cause this problem, I am sure there are more I am not thinking of currently.