I got burned on this one too with a stop at 15.30 that closed at 14.15. Schwab say there is nothing that can be done. I usually throw those class action envelopes in the trash but this is one that I will be waiting for. I'd advise you to watch for it too.
I'm looking for a place where I can review a "60 minute" chart history of QQQQs for more than the past few months. Any suggestions would be appreciated.