I had dropped Mage a long time ago, rejoined and went to take the mage quests from Ulaven.
One part of the quest requires you to use safety one time.
I've been using safety, but I have a higher level from sorceror and therefore it's not updating that part of the quest.
I think this is probably similar to the problem that existed doing the warrior quests, unobtainable if the ability is too high.