Try this:
- Open gnome-terminal
- Press & hold menu key ( http://upload.wikimedia.org/wikipedia/commons/thumb/1/1d/Kontextmen%C3%BC.jpg/1280px-Kontextmen%C3%BC.jpg )
- Move the mouse pointer around
You can 'paint' over the terminal with menu windows. After playing a while the whole Cinnamon froze so that only mouse cursor moved and nothing else responded.
I am not sure which component is responsible for this. It does not happen on gnome-shell 3.8.4-8.1 so it might be Cinnamon specific issue. Tested with Cinnamon 2.2.13ubuntu1 on Ubuntu 14.04.