Has anyone ever experienced getting a canceled order filled hours after the close of the trading day? Arca experienced some technical difficulties last Wednesday afternoon which caused an order I put out to get stuck briefly, before it was canceled. The position never showed up in my blotter by the time the day was over and I went home assuming that I was flat (as I always am). The next day I log on and find out that the stuck order got filled and showed up later that evening after I was long gone. Just my luck, I was now long the market overnight into the huge crash on Thursday morning, costing me $7k. I don't see how this can be acceptable at all. Does anyone think I have a case against Arca? Any suggestions at all would be appreciated.