I was having problems at the Auction house, and was not able to browse any auctions, and had dificulties posting them too.
However, there is a config setting in auctioneer that I found helped. I needed to set my 'Protect the Auction House Window' to always. You can do this by walking up to the auctioneer and interact with him; choose the configure button. Under Util Modules; AHWindowControl, change the setting here.
Doing this allowed me to browse the auction house again.
Other information that may be usefull if you are still having difficulties : I am using AuctioneerSuite-5.11.5113 from http://auctioneeraddon.com/dl/#preview
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