Can't interact with simulator...

Hmm, one of my guys installed IntelliJ 12.1.3, set up the AIR project on which we're working, successfully built and ran the application in the simulator, BUT, cannot interact at all with the simulator.  All mouse interaction is mute.  There's no errors, breakpoints or any other issue with the app itself, so, what could cause the simulator to be unresponse to mouse interaction?

Thanks!