frame:UnregisterAllEvents() is for 1.9. It works on test. Iriel and the others are pretty fast on those updates it rocks.
What event are you unregistering for? Try it on test server and see if it works. I encountered a similar problem with UNIT_AURA on 1.8 and it works fine now on test.
Found thread:
http://forums.worldofwarcraft.com/th...ation&t=274802