Nilus was supposed to report it, but I'll go ahead and do it - yesterday when playing a Tournament game a curious bug appeared during the auction in the 10th round (I believe it was during the food auction). I'm not sure what exactly triggered it, but from that point on during any auction only 1 unit of ore/crystite/food/energy could be bought/sold. After that it got blocked and buying/selling during that particular auction was impossible.
Game:
http://www.planetmule.com/hi-score-game/game?game_id=3944