I’ve had this issue for a while now, since I thought I could fix it myself. Almost all my programs have lost their icon image, which is not fixable by applying a different icon theme unfortunately. Just installed the Reversal icon pack to test that. My settings are attached here, sorry for the german:

I am assuming this is due to some of the weird behaviour I have had for some days months ago. Gnome would just not load and instead show me an error screen. So I had to uninstall gnome entirely, then reinstall it and that magically fixed it, but my icons were gone.

  • Yikes. Something is missing. Is this Debian? You could swing by their forums or IRC and get sorted out fast. I’m sure there is a dpkg command that fixes this up. As for the icons, there is definitely a missing package related to adwaita or some lingering config file needs to be reset to defaults.