For months, the IB system has allowed 25% overnight, then Friday from the beginning of the day a new higher ovenight initial margin requirement was apparent on my account page. I called IB to ask what was going on - maybe there was an error in computing the margin requirement (it was even less than 2:1)? The first IB employee I talked with could not explain what had happened, but said a "margin specialist" would call me back. More than an hour later, no call, so I dialed up IB again, told a second employee about the earlier call and that I really needed to talk with someone who understood what was going on. He also said that a "margin specialist" would call me back, but was a bit vague about "when", so I told him that I needed to know within 10 or 20 minutes. I was getting angry and said that a senior person must call me back SOON, as I have other accounts I could move money from to IB if necessary, but that it takes a few hours. I was also thinking of closing some positions at IB and duplicating them elsewhere. NO CALL BACK was received (not even 2 hours 30 minutes later)! Luckily, I undid some positions and used other brokerage accounts instead, because at 3:50 the high overnight initial margin requirement became the maintenance margin requirement for 10 minutes. If I had not acted, some positions would have been liquidated. This is CRAZY - IB changes the way the system works, and when I identify that something is different, they do not respond to questions about what is going on. After 4:00 I called and asked what was IB doing? The employee implied nothing was different, and stated that no margin information was ever discussed on the phone. Also, there are no "margin specialists" (uh, so what about the 2 calls I had made earlier in the day, at which time employees told me my questions would be answered by a "specialist" calling back?). I asked to talk with a more senior person and someone called back in 15 or 20 minutes. He just went over the margin requirements but did not indicate that there had been any change. Over the past 2 months, I have had other annoying problems with IB, but Friday was the most unnerving yet. Now, I am afraid of IB as from this ET thread it appears margin changes were made for many accounts on Thursday, yet Friday the employees I talked with were still not really clear about what was going on. Is IB trying to gloss over that they previously allowed 4:1 all of the time? While I will probably maintain an account at IB for cheap futures trades, I am now looking to do more stock trading elsewhere... Does Cybertrader do bizarre things like this?