A daytrader told me that IB holds stops internally and sometimes fails to put them out to market when the stops are activated. Thus a trader will see the trade go against her beyond the stop set. In such situations, IB makes the trader eat the extra loss, saying that it was a system problem, etc. Is this true? I wouldn't want to use a broker like that. Sure, a broker make mistakes at times, but it must break the trade and make you whole. Has anyone had this type of problem with IB?