[a_c_s]

I am personally on Sprint, but have used various cooked ROMs and generally had few issues with GPS...as someone else advised, try quickgps first to see if it helps you lock...if no GPS apps are working at all, flash back to stock and you'll know if it was that particular ROM...if so, hard reset (after backing up PIM data) and try to reinstall the custom ROM again...if problem still persists, I'd just try another...