tdameritrade ruined thinkorswim. the programmers sucks a.ss. leaving tdamertrade once and for all. i wouldnt recommend using them as your broker. thinkorswim is a buggy mess.
I'm starting to notice this as well... I had a bunch of puts on RIMM that apparently failed to go through last week
...I like the interface, but the fees are high and the site has issues all the time now. I joined maybe 8-9 months ago and it's gotten worse.