They are fixing it now:
Cancel trade: Matching error (BTC sold: [tid:1309577590796944] 1.500000 ฿TC at $2.99000)
Really? They actually noticed? How about the "last trade" issue?
I don't know if
they noticed (today's bogus low price on the ticker), or saw my support ticket.
"Selling" 1.5 BTC for only $2.99 made my balance unexpectedly lower.