I let my system do the full 3.5.13.2 upgrade, but now almost all the 
icons in my T-menu (kicker menu) are gone. The program icons are still 
there, but the category icons are pretty much all gone. I saw the same 
behavior on another system of another user that upgraded.

I'm using Ubuntu Precise. I have no other DEs installed.

Does anyone here know what's going on and whether it can be solved?

Thanks in advance,
Julius