I just updated ubuntu 12.04. (some regular update) There were some gnome-updates and some nautilus-updates I think. After the update I can't start spotify, skype, krita, tv-browser and prehaps more programs. Instead of a filled arrow on the left side of the launcher they show the lines of the arrow when I try to start them. Spotify starts, and I see the icon in the upper statusbar. From there I can change tracks, start and stop etc. But I can't see the window. The other programs I can't do anything with.
It feels like a bummer cause I choose 12.04 for the stability to use it in my business. I hope this can be resolved somewhat quickly.