Anyone have any idea what happended? IB didn't. I was long AMKR at $5.32 at 11:21 EDT. I had resting stop/limit order to sell, stop 5.22, limit 4.00. At about 11:42 my stop hit, the pending page turned black again, and the order dissappeared. But, for about 5 minutes the execution page showed no execution, my account page showed I still owned the stock. Finally, I just placed another order and sold at 5.17. One last thing, when I placed this last order, it initially gave me some kind of error message like "order not available" or similar to that, before it actually executed. I'm baffled. Should I just avoid using stops with IB? Any input appreciated.