Military AI Works

I'm getting a problem where an aircraft will take off and do a circuit, land, turn off the runway, be told to contact ground and then nothing happens. The plane just sits there on the taxiway. I've checked the AFCAD and that appears to be OK (there is a definite series of links to the parkiing spot) so I'm at a loss as to what's happening.

Can anyone give me some idea as to what's going wrong?

Thanks.

To eliminate the AFCAD change the flight plan to a different airport and see if the same thing happens.

Or it might be the aircraft try the same flight plan with a different aircraft.

Sorry I didn't get back to you sooner, Graham, but no matter what I do - changing aircraft, airports and AFCADS - it still doesn't work. It was only an experiment anyway so I'm not worried about it now. Thanks for your suggestions though.