I did a fresh install of Ubuntu 12.04 and completed all updates. I updated to the latest stable kernel. I installed Gnome and the extensions. I did have it working and working well for a few days and then I needed root privileges for a task. As soon as I entered the root command my Gnome desktop went haywire.
I rebooted my system and now Gnome looks just like Gnome classic. I can no longer select "shell theme" from "advanced settings". It looks like somehow all of my extensions went away as well. Has anybody ever experienced this? How do I get my Gnome desktop back? I really miss having it, for it was awesome.