After following through the entire Mage's Guild quest in Oblivion for the first time, I get to the door through which Mannimarco is waiting oh-so-patiently, and the game freezes on the loading screen. This happened over TWENTY times. I said, oh, fuck it, and went to do something else worth my time.
A month passes.
Now, having gone through several other aside quests, mostly Daedric Prince/Princess missions, I return to try again. Miraculously, I get through the door and up to Mannimarco...and nothing worked against him. My sword, my magic, a different sword, a bow, another bow for some odd reason...only summoning a Golden Saint and Flesh Atronach did anything against him. A five second fight turned into fifteen mintues. Ugh.