Have started to see black graphic blocks obscuring the display of text in multiple applications (Quicken and Powerpoint) while in Windows 10. At first I thought it was limited to Quicken. When I open the Quicken file I see these black boxes on top of text that should be displayed. In many cases the display of them is predictable... they show up all the time in the same place as I enter a new transaction in Quicken. Then I used Powerpoint and the same thing was happening in that application. It made me wonder if this was a Windows problem. Any help?