On my Mac mini, app icons have gone missing for some apps (Terminal, Chrome, Spotify, Skype) from the Dock and elsewhere.
See a screenshot of the Dock. When I hover over the empty spots, I can see the names of the apps and launch them normally.
And here's one of the app switcher (it was kind of challenging to take this with cmd-shift-3, btw):
I don't remember doing anything special to make OS X lose the icons.
At first I thought it was some temporary glitch, but logging out & back in didn't help, and neither did rebooting the machine.
Upgrade from 10.6.4 to 10.6.5 didn't improve the situation either. Anyone have ideas how I could fix this?