Hey Araxom, you might want to pass this along to the devs so they can look into this. There's another issue with the GAH, in which some items are appearing on the GAH for a 0 gold bid and no buyout, and when people go to bid on these items, they can't because it throws up an error. Either you have a bug in your system apparently caused by the maintenance last week (that's when I first noticed this), or someone is bidding, and then using an exploit that zeroes out the bids on items so no one else can bid on the item. Mind you this only seems to happen on upper-middle-end to high-end items from what I've noticed. From what I've been told by a mate of mine (this happened to him yesterday), when the auction ends, the seller gets the item back, and the buyer gets his gold (though this issue has never happened to me, so I can't confirm this.) I'm not sure about RMAH (I never use RMAH), but it could also be possible that this is why people aren't getting their GAH payouts.

You might want to have the devs look into it while they're doing maintenance today, as this could potentially cause problems on both ends.