Broken gtk theme?

Solution 1:

It's problem with unity-settings-daemon / gnome-settings-daemon. You can report a bug here.

• On Ubuntu 14.04 and newer following command should fix problem (run it from a Terminal):

  sudo killall -9 unity-settings-daemon && unity-settings-daemon & disown
  

• On Ubuntu older than 14.04 tou can try (run it from a Terminal):

  sudo killall -9 gnome-settings-daemon && gnome-settings-daemon & disown
  

Solution 2:

As I commented, an update brakes compatibility with Themes.

So you'll have to remove the Gnome 3 Team PPA and the Ricotz testing PPA then downgrade the packages to the Ubuntu version.

Install ppa -purge to make this easier.