Thanks for the info. I have encountered this problem too. This will help when running mappoint interactively...but I also get this message when my vb.net app uses the mappoint control. Do you know if there is a way to detect whether, as you write, "...any instance of MP stuck in the task manager.." from within my .net app? I know I can check for my form's existence....but sometimes my form (the one with the mappoint control) has previously been closed and the error still occurs.

thanks