Staff of Starlight - Forcefield Bug?

[SethGekko]

Is there a known bug with the Staff of Starlight quest? My current task on the quest list is "Pay a visit to the tower of Archmage Rezo". Previously, I had to visit 3 altars, and defeat 3 mages. According to walkthroughs, this should remove the forcefield from the Mage tower, and I would encounter someone at the entrance.

Well, the forcefield is still there, and there is nobody at the entrance. I am unable to continue in the game without completing this quest.

I've searched the forum, and found 2 threads that discuss this issue, but neither of them had a solution. It's been 2 years since, so possibly there is some knowledge of this by now?