Could be a couple of things.

1.) Have you got enough starting cash? $10,000 would be a good start or reduce the lot size.

2.) Probably best to use a standard broker account like "Alpari" as the format of the pips is sometimes important such as 4 decimal points instead of the 5 you get with some brokers.

Other than those two points, you shouldn't have a problem with it.

Regards,