I could not find this specific issue on Google. After I updated from Ubuntu 15.04 to 16.04 LTS, next to xfce4 and unity not working correctly, also the icons from the Breeze icon theme are behaving in an unexpected manner. I have tried to reconfigure and reinstall these packages, however the problem remains.
- Icons such as the Firefox icon are missing
- Instead of the blue folder icon I am seeing a simple flat white icon, this happens as well for icons of files with extensions of images, text, jars, etc.
Thanks for your help.