Ouch... it's not an RUU problem, i can tell you that.
You can try to revert back to stock, by using Rempuzzle. It's the fastest stock ROM for HTC buzz, trust me on this
Can you find a proper RUU for Stock for me! Also, I have upgraded to an unofficial port of Cyanogenmod 9 which is ICS, will that affect the reason why it's not working? I am running ClockWorkRecovery 4.0.??