Same problem than in comment #10, but trying to reset the ~/.config (e.g. http://www.linuxslaves.com/2016/05/fix-ubuntu-no-icons-panels-launcher-except-background.html) seems to fix the problem for me. No more investigations...
Same problem than in comment #10, but trying to reset the ~/.config (e.g. http:// www.linuxslaves .com/2016/ 05/fix- ubuntu- no-icons- panels- launcher- except- background. html) seems to fix the problem for me.
No more investigations...