On Normal, when a search is made, no items appear. This has been tested on multiple clients.
When I logged in today, I did one search, where I was able to get a few pages of results. I then attempted to put up an auction, that had failed to post the night before, which also failed. At that point, searches either hang or come up with no items (including basic searches with no parameters).
The auction house was cleared. All the items have been deleted, and you will not be refunded. Have a nice day.