[ubuntu] Cinnamon becoming unresponsive

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http://ubuntuforums.org – Hi, I hope I'm posting this in the right place! I'm using Ubuntu 12.04 and have the following desktop environments installed on my system: Unity, Gnome Shell and Cinnamon. My favourite by far is Cinnamon, but I'm experiencing a very annoying problem with it. After a while of using my computer, the system will suddenly becoming unresponsive. It's not a full freeze, as I can still move my mouse and the cursor will change depending on what item it's hovering over (still shows text cursor over text, hand over links, etc.). Nothing I do can unfreeze it, as I cannot launch the terminal, close wind (Hardware)