grabbit, First: you imply IB is doing something suspicious with your order. I assure you (you can also look at an attestation from Deloitte and Touche that is posted on the web site) that this is not the case. If you are concerned about market orders, why not try stop limit. As for stating that your stops are not being triggered properly, why not send the details to the help desk at the time in question and ask them to run an audit. If you are not satisfied with your response, send me the details and I will personally make sure it is investigated. The double bid/ask rule is confusing and often is mis-interpretted. Nevertheless, if you provide the details and examples it will certainly help point to any problems.