Mac mini wont shutdown I can't shutdown my Late 2012 Mac mini, running El Capitan, in the normal way, by selecting the Shut Down... on the Apple menu. Every time I try, Finder vanishes and the shutdown progress freezes. I'm still able to work with the Dock, so I can shutdown using Terminal. In long term it's really annoying.

Hopefully someone has an idea whats wrong.

[EDIT] I just found out that im able to shut the system down by sign out and them use the displayed shutdown on the bottom.
Close all Mac OS X apps before shutting down
Try to determine if one particular app is causing the problem. Maybe one app always aborts the shutdown process. Try updating to the latest version.
Open Disk Utility. Choose the your main hard drive and click Repair Disk.
Usefully shutdown freezes are caused by incompatible or outdated drivers e.g printer, scanner software. Open OS X activity monitor. Do you see any high cpu processes or unresponsive applications that are marked red?