Comment 10 for bug 1215798

I have the same symptom with gnome-terminal (not tested remmina, will do).

It does not happens everytime, but quite often when I do a Alt-F2 r to restart the shell (which is unfortunately necessary; gnome-shell here is severely leaking memory and after 8 hours it's a 8G molasses than need to be restarted).

After it happens, gnome-terminals are transformed in phantom windows. You can see them in overview, but you can't see them when exiting from overview nor focus them. Sometime you can move one window from a desktop to another, and it will accept focus again (but you'll not be able to resize nor move it).

Strangely, even if I have tens of terminals open, it seems that I have just one process (maybe this is the problem?). If I killall gnome-terminal I end with a even more "nice" phantom windows, like the grey one in the attached screenshot. It behave as if it is glued to the screen (sticky), and it let pass clicks to the (obscured) window below. I need to logout/login again to get rid of it.