There is an auction house issue on some 
U.S. servers and Blizzard is resetting them at 4:00 A.M. (PST) to fix the issue, check the list to see if your server is on it!
The following realms will be restarted at 4:00 AM PDT on 04/20/06 in order to resolve Auction House related issues:
Anetheron
Blackhand
Dethecus
Durotan
Earthen Ring
Elune
Gilneas
Lothar
Silver Hand
Spirestone
Zul'jin
We apologize for any inconvenience that this may cause.
Links
World of War - Source
