Hmmm

You may be onto something with the Meego theme being installed

I downloaded the Windows7 theme and selected this and used it for about a week, the other day I checked what was new and noticed the meego theme so I downloaded it and installed it (through app manager)

After that I went to change the Windows 7 theme and noticed that I couldnt change it, I assumed it was that as someone else had the same problem since installing the Windows 7 theme

I dont have widgets gallery installed