[ubuntu] Unity 3D keeps changing to Gnome randomly

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http://ubuntuforums.org – My computer was totally fine last night, but when I booted this morning I booted into Unity3D and noticed the Gnome bottom bar was visible (with the workspaces icon in the bottom right). The interface then randomly switches between Gnome and Unity3D, by changing the top panel between the two different styles. I only ever use Unity3D so how has this happened?! Thanks Screenshots: One minute it is normal, I try to click the regular close button for Unity (top left) and the top bar changed to Gnome. When I open a new application, it changed back to Unity3D... WTF?! Help :( (Hardware)