I recently had two problems with TradeStation's display and calculation of "Available Buying Power" in one instance, it was understated and the trade desk allowed me to execute an adjustment even though the platform would not accept the order. In the second instance, it place my IRA account in a margin call. In this case, the platform let me make the trade, but the next morning I received a margin call notification. The margin call was due by 3 pm the same day. One of the major issues with TradeStation's margin provisions is how they handle a that closes an existing position. In this case the funds are not credited to your account for one day. This can place you in a margin call situation. I spoke with the Margin department manager, but was told since this account is self-directed, it is the trader's responsibility to ensure that an IRA is not in a margin call position. I filed a complaint with their client services and got the same answer from the same person (no additional higher level review). I spoke with TOS, since I have performed similar trades with no problem, and they indicated that they provided the credit immediately when you close a trade. TradeStation's margin department does not provide the credit for one business day, therefore, you don't get to use the funds to initiate another trade for one day. This can be a big problem for delta neutral traders. Conclusion, using TradeStation for options trading in a fast moving market can be dangerous to your financial health due to their treatment of the funds on closing positions vs TOS. Last, has anyone in the community had a similar experience with TradeStation or another broker?