I have two orders at Schwab that haven't filled but that I'm unable to cancel. One was a market order I made at 9:36 (ANTH), millions of orders have filled since then but Schwab shows my order open. I put a limit order another stock (MKRS) at 9:57 in which shares have traded at my price but the order status still shows open.
I too have had an Ameritrade account for years but opened a Schwab account a year ago and have really enjoyed it w/out problem until today. Schwab has been my luckier account this last year.
EDIT I just called Schwab but was told that due to high call volume, my wait would be over 20 minutes before I could speak to anyone. I hung up. (I'm going to eat breakfast; I'm out west.)
I won't insult your intelligence by suggesting you really believe what you just said. -- William F. Buckley