Glad you've got it worked out.
I've run into the same issue a few times, and its not affected by the "stop project at end" option in preferences. It just keeeeps going. The control bar is rendered useless, as well as the space bar. I eventuall CNTR +ALT+ DLT and end the program. Fortunately, I am able to save the project before killing X1 in task task manager, but the issue does exist.
Matt