As soon as the 7.3 came out, I went to the auction house to sell my obliterum, sadly I couldn't have the addon to work, so I did by hands.

I included an image of what I see when I open it.

Steps to reproduce

I can replicate by simply installing auctionator and going to the auction house. The panel is empty in all 3 windows (Buy, Sell, More...)

Addon list

Accountant, Ask Mr.Robot, Atlas loot, Auctionator, BagBrother, Bagnon (default addons), Easy Obliterate, Quartz, SexyMap, Skada, WorldQuestTracker, DeadlyBossMod

Images of bug

The 4.0.19 release should address this. Please refer to the conversation on curse. Thanks for taking the time to raise this!