desktop stops responding to clicks

[MarkHaysHarris777]

I have loaded ubuntu-mate from 0.4.15-17 through 0.5.5 and have been seeing the same behavior with desktops. 

Initially everything is OK, I can open terminals, apps, etc... After some period of time, the screen will not respond to mouse click or allow focus (via mouse click). 

Moving the mouse causes the screen to wake (from powersave mode), and the mouse moves. Also The screen continues to redraw, i.e. if I have a sysm monitor on the screen I see it updates. I cannot click on an open terminal, or do anything except move the mouse around. 

The system is still responsive -- I can ssh into the rock64. 

Is this a know issue? Is there a fix?

Many thanks,
Scott.

P.S.> I always started with a minimal image, and used install-deskop to get mate up an running.

This is a known issue with screensaver and auto-lock.  

To get out of this situation do this :

   press the enter key to clear the buffer

   enter your password

   press the enter key      ( the computer will be unlocked )

Then, go into System -->Preferences -->Look and Feel --> Screensaver

   uncheck :  Lock screen when screensaver is activer

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This is a bug in the auto-locking mechanism, in that it does not show you the unlock dialogue.