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I cleared all the hot keys, so all the bars were empty.
Returned the key bindings to default.
Quit the game.
Installed one of the 3x25 ui's.
Did the bind the keys, beat the boss, and log out...

I'm using the BIG version and am enjoying it. Before I installed it, I had rebound most of the keys to suit myself. I had a tough time re-assigning the keys, but on the third attempt it worked.......