How is your external display connected? Via a regular port or via some propietary hardware system? It seems kind of strange that adding a new screen would trigger this issue.
If you feel adventurous please install unity-2d from this ppa https://launchpad.net/~aacid/+archive/ppaprecise/ and do the following
* Open a terminal
* Write "killall unity-2d-shell"
* Write "killall unity-2d-shell" again
* Write "unity-2d-shell"
* Try to reproduce the problem with alt+tab triggering the hud
* Attach here the output of the "unity-2d-shell" command, which shall contain the logging of which keys you pressed/released and why the hud was triggered
How is your external display connected? Via a regular port or via some propietary hardware system? It seems kind of strange that adding a new screen would trigger this issue.
If you feel adventurous please install unity-2d from this ppa https:/ /launchpad. net/~aacid/ +archive/ ppaprecise/ and do the following
* Open a terminal
* Write "killall unity-2d-shell"
* Write "killall unity-2d-shell" again
* Write "unity-2d-shell"
* Try to reproduce the problem with alt+tab triggering the hud
* Attach here the output of the "unity-2d-shell" command, which shall contain the logging of which keys you pressed/released and why the hud was triggered