Display problem

[Bill]

Hi,

I have a curious problem with my video output...

It is obviously not a hardware issue because when I dual boot to 
Windows, my display is OK.  Also the grub menu and the Mint login screen 
are OK.  I have a separate administrator account and this account is OK 
as well.  The problem affects only my user account.   I am using Mint 
(the latest version) and the Mate 1.26.0 desktop.

The problem is that about 10 pixels of the right side of the display is 
black.  The bar at the bottom does go all the way from the left to right 
sides of the display.  The problem only affects the display area.  I 
tried to see if changing the resolution of the screen but the problem 
persists in all resolutions.  All of my apps when running at full 
screen, have the left scroll bar blacked out.  I don't know if it works 
or not.  When I reduce the size of the app window, the scroll bar is 
visible and works. It seems that it is a problem in Mate but I don't 
know where to look to correct this behavior.  Any input with this 
problem would be appreciated.

Bill Stanley