Can´t shut down or restart iMac from the apple menu (v10.11.6)

After upgrading to OS X 10.11.6, I´m not able to shut down or restart the iMac from the apple menu. It cleans the desktop, but the programs are still available. This happened for the first time immediately after upgrading. The only way to do a shutdown is to use the power button or to start a terminal window as superuser and do a "shutdown -h now" command.

I´ve tried to start up from OS X Recovery (Command + R), and run the disk utility, verify reported no problems.

My iMac:

OS X El Capitan
Version 10.11.6
iMac (27-inch, Late 2012)
Processor 3,4 GHzIntel Core i7
Memory 24 GB 1600 Mhz DDR3
Graphic NVIDIA GeForce GTX 675MX 1024 MB

Thanks
S.

I wonder if you have an app that the upgrade has put out of date. Could be worth checking your apps for updates.

Personally I do not go this upgrade route.

Backup, download operating system and make a thumb drive with DiskmakerX, then erase and format andwhen OS installed, copy back via SuperDuper etc.