In OSX, every process draws and handles its own menubar. If one process goes comatose, it will stop drawing its menubar when you switch to one of its windows, and so the menubar from the last process you visited will still be visible on the top of the screen (but, unusable because the process you just switched to is dead). If you switch back to another live process, it works fine. and handles its own menubar just fine.
Perhaps tshow gets confused because of the how you can have the dead process's windows in front, and it still looks like the menubar for another app should be active, while actually it's not. Or maybe his OSX really does somehow manage to wedge the entire menubar reguarly. That would presumably have to mean that the window manager itself was wedged.
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