I did. Not sure this is the cause as I'm having multiple issues after the fact. What did you do to remove said files?
I found there was a background service that consumed huge amounts of RAM that was left over from the iMessages beta. I found it by going into activity monitor and sorting by virtual memory. I killed the process and everything on my computer started going a lot faster. I had thought that Mountain Lion just made my computer really slow - turns out it was this left over buggy service that wasn't shut down when the rest of the beta ended / was uninstalled.