Can't get yosemite to working after waking from sleep mode

I just installed Yosemite to my Mac Mini.  When the computer goers to sleep for more then 30 seconds I can wake the computer but then after i see the desktop I can't do anything on the computer every click i make does not respond and I have to force the computer to shut down and I have to reboot every time my computer goes to sleep.

I have the exact same issue for the first time after installing Yosemite.  On resume from sleep, I can see the desktop, and can move the cursor with the mouse, but clicking on icons, etc. does nothing, and the keyboard does nothing. A cold boot works fine. This is a Mac Mini bought in the Summer of 2014. I run no unusual software. I have eliminated all log in items in Preferences/Accounts, reset the NPRAM, have no peripherals (other than standard Apple mini mouse and wireless keyboard), and have shutdown and unplugged to reset.  It makes no difference whether a password is required or not - once it goes to sleep, this is the result, and only a forced shut-down by holding the power button and a cold boot give me control back.  This problem does not appear if it merely goes into screensaver mode - which I invoke with a hot corner.

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