This problem started after an update. When I logged in using NX, I noticed that my theme looked very ugly. The show desktop button was some folder icons, the lock screen function wasn’t working, I noticed some errors in my terminal while trying to run X based tools: Xlib: extension “Generic Event Extension” missing on display “:1000.0”. And the gnome-settings-daemon kept crashing frequently.
From AAron44126 over at the ubuntuforums found the problem:
“Fixed. gnome-settings-daemon was crashing, see this bug.
Navigate to /apps/gnome_settings_daemon/plugins/keyboard.
Uncheck the “Active” box on the right.
Log out and log back in.”