Hi...

Download version 5.9 (Beta) of Auctioneer
Delete all your Auctioneer dirs and Auctioneer related files from your addon directory. (Backup first you you think you need them)
If you need help in what dirs to delete, follow this link:
http://wiki.norganna.org/Installing
Unzip the new auctioneer suite 5.9 to addon dir and voilá!
Fully working Auctioneer...

Hope it helped...

Shandril of Grim Batol