Comment 9 for bug 752000

Read about this on a blog somewhere, so I tried it out, and I encountered this bug as well (minus the compiz crash, since it hadn't crashed for me). I ran setsid unity which triggered a compiz crash, but now the lens works.

I noticed that the menu in the upper right hadn't appeared until after the fix. I could type in the search bar but the lens was blank. Hope this helps you narrow it down.