I'm running 12.04 LTS and I can't seem to see any thumbnails for pictures, videos, anything. I have checked my preferences "Show Thumbnails, Always, files under 10MB, Local Only" which makes sense but still, no thumbails.
I was having problems with Unity 3D and my nvidia card and I entered a force_unity_start code somewhere. Now I got gnome 3 working (turns out i just had to turn zoom off) I'm still having this problem.
please advise if you need any more information to help me with this!