Re: scottrade IDIX issue.
If he was on margin in the account, then yes they can make account specific rules. A good example would be if the account was hevy in small biotechs.
But for a cash account (or a margin account account that has a net cash positive position) that makes no sense.
Interesting that somebody over on Yahoo! made the same point about E-trade a few hours ago.
I really don't know if this is something very strange, just a mistake, or total BS (no accusation intended, just listing the possibilities).