Their client crashes with an invalid access in busy markets, particularly at open. Happens on two different state-of-the-art quad cores under both XP and Vista, either ATI or Nvidia. I've looked at this 100 different ways and tried 100 different things. Eventually I found two smoking guns pointing at problems near their servers during busy market hours.

They denied this as a possibility and told me to get a new ISP. I have a fiber connection which is 100 Mbits both directions. My ISP has proven itself to me, but that is beside the point. Even if my ISP was causing the problem (it isn't), does that somehow make it ok for the trading platform to write a crashlog and hang?

As a plus, I could always reach someone on the phone. Never anyone who knew enough to help though.

The bottom line is that these guys put tons of effort into shifting blame instead of fixing problems. As a company they don't know which hand is feeding them. They can do no wrong, and say they have never heard of anyone having any problems. This doesn't seem right because I keep running into people with problems and I'm not in their tech support!