Wilmotron

Indeed, I did. Perhaps I need to go trolling the source code and see if something fires when focus is lost.

@godarklight: I use joystick mostly. It happens with it plugged-in; it happens with it unplugged. When I go over to vanilla KSP, everything works as expected.

I found nothing of interest when I searched this thread for the word "throttle," so I'm going to throw this issue out there: when I click away from the KSP window without the mod, my throttle does nothing. When I click away from it with the mod installed, it instantly goes up to one-half. This is tremendously frustrating to have to remember to shut down my engines every time I click away. Has anyone else encountered this?