I had this earlier, definitely something weird going on... Fortunately, it can be fixed by opening up the launcher,going into options and loading the game in safe mode. Worked for me
If this wasn't a cash on delivery trick, my guess would be that someone hacked you and used your account to buy fireworks from their account (Thus transferring all of your AD to their account). They probably also sold an item of yours for a small amount of AD and quickly bought it out on their account.
This exploit has apparently been floating around for a while, in fact, I have seen a few auctions sitting on minus bids over this past week but i figured my game was just being a bit glitchy. Now with the events of today, I realize that this is a lot more serious than people think. If this has been going on for a week,…