Dock is not working anymore All of a sudden some running applications were not shown on the ⌘+⇥ on-screen list. I had to restart my MBP, running Yosemite 10.10.2.

After restarting, ⌘+⇥ was not working any more (no app shown on screen, not even the Finder) and the Dock showed some non-running apps as running (with the circle). By clicking any 'running' app the circle disappeared.

So I opened Terminal and run killall Dock.


The Dock did not restart.
⌘+⇥ is still not working.
Restart does not work. 
Shut-down does not work.
Spotlight works and I can launch apps.


No apps were installed between the normal, working stage and this absurd state.

What's the problem? Any suggestion?
Try re-applying the 10.10.2 update, or download and install the 10.10.3 combo update and see if that fixes it.
Here's the link to the combo updater:

https://support.apple.com/kb/DL1804?viewlocale=en_US&amp;locale=en_US