Yeah... I would have guessed TipTop.
This problem is actually being caused by a bug in Blizzard's code for the Blizzard_TalentUI addon. I found it yesterday and told Blizzard about it. I am told they will fix it in the 4.1 patch.
In the meantime, any addon that attempts to load the Blizzard_TalentUI will throw this error. nUI loads it so it can manage the frame. So, I'll disable that function in nUI with tonight's update and that should temporarily "fix" this problem.
|