Problem with FSX AI

I have a problem with an FSX AI flight compiled with TrafficDataBaseBuilder. The flight compiles without errors and the AI flight can be seen in FSX using Traffic Explorer. Here's the problem. When the Departure time is met the Aircraft goes from the Sleep state to FlightPlan, PreFlight and then Pushback, but as soon as pushback begins the aircraft disappears from FSX and the flight is removed from Traffic Explorer. I don't know if the problem is with the aircraft or with the departure airport. I've checked the airport using ADE for FSX and run the Fault Finder but no problems are found and I can't find any problems in the aircraft.cfg file. Any ideas?Dave Westbury