Unable to drop, trade, set up a shop, or duey

Apparently, there's a new meso exploit out. According to a friend, the old one worked by hacking the donation boxes to think that you were giving them -2.1bil mesos, and then you'd end up with 2.1bil mesos in your inventory. The new one supposedly works by tricking tatamo into thinking you're giving him -2.8k manon tails then receiving the manon tails and NPCing them. Try not to sell highly-priced items in the FM until this is fixed ><

So are you saying that NEXON had the audacity to not put a failsafe with the minus sign to prevent this from happening? GG.