Me too. I had to reset my password to get in, now I can't set it as User CP gives this error:
"Your submission could not be processed because a security token was missing or mismatched.
If this occurred unexpectedly, please inform the administrator and describe the action you performed before you received this error."
Note also that the link for informing the administrator doesn't work. Something about a missing token. I'm guessing the administrator email address isn't setup in the vbulletin configuration?