I placed two orders in the previous version wallet, however, they disappeared in the "open order" window after the wallet was updated to the new version, but I can still see them in the market order book.
It means I have no mean to cancel it.
What's strange is that even I use the command wallet_market_order_list in console, I still couldn't find them.
The below is the transaction info if it helps.
Transaction #741d657f
Block #268987 , transaction #0 , next #1
Timestamp: 2014.8.20 GMT-4 1:11:50AM