@Sup, I'm not really sure what it is you're trying to get me to do, heh.
I've disabled plugins already in config.php. It's generally the first thing I used to do whenever I had a problem, because it was usually caused by my own code, heh. That doesn't seem to be the case, here.
As far as the MySQL you gave me... I think you meant a usergroupid of 6, not a userid. Using the following SQL, I did check to see if anything was wanky:
Code:
SELECT * FROM user WHERE usergroupid = 6 OR FIND_IN_SET(6,membergroupids);
Nothing seemed out of the ordinary--all my Admins were there, and no one was there who wasn't supposed to be.