But it's that popup, correct? It should only last a few seconds so you shouldn't ever have to break out of it.
Flipping between the old and current screen as a background is an old bug though, and I haven't been able to fix it 100% (works in windowed but not fullscreen, on ATI but NVIDIA, in Linux but not Windows, and every option in between). It's purely cosmetic though, and probably already in Mantis.
No, it's not that problem. It's difficult to describe by words. I tried to capture a video of it to show what happens, and the situation became
extremely strange: while I was capturing the video, everything worked fine

, so I minimized FS2 to deactivate FRAPS. When I reopened FS2, it continued switching between minimized and mission simulator screen. Also this time, I could only open the Task Manager to shut down FS2.
The original problem was: I selected the Mission Simulator in the tech room, and instead of seeing the "Reading mission XXX.fs2" (or whatever it is) pop-up, I saw briefly an empty mission list, then it switched back to the tech room and then back again to an empty mission list (it is so quickly that it does that about 10 times per second). It continued doing so until I shut down the game.
That was the better I could explain. I hope you understood.
