After installing Yosemite, cannot login after wake from sleep mode

After upgrading to Yosemite this morning, I've had the problem that after the computer goes into sleep mode, I cannot log back in to use the computer because I can't enter my user password.  The screen looks fine after I press a key on the keyboard or move the mouse (I see the users and where I would type my password), but mouse clicks do not allow me to activate the password box (however, I do see the mouse pointer and can move it), and any buttons pressed on the keyboard have no effect.  If I shut the computer down, I can login without problem.  Any thoughts on how to resolve this?  I'd hate to have to turn the computer off every time I step away for 10 minutes...

Hi ..
See:  "If your machine only boots into Safe Mode (Shift key) any of these may be the cause"  >  ..Step by Step to fix your Mac | Apple Support Communities

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