After 8 years of continuous duty my main desktop PC died.
I put together a new Skull Canyon NUC over the Holidays and reinstalled Ubuntu 16.04.1 LTS and a new downloaded copy of MC22.0.51. I am using the Intel graphics that comes with the NUC. When I started MC22 I noticed horizonal lines all over the main window of MC22. As I moved the mouse over the areas where these lines where placed, they would disappear. The effect was like using the eraser function in a graphic drawing application. Once gone, the lines did not reappear unless I changed the view of the main window.
I have attached a small portion of the top of the MC22 main window to show what I am seeing. Note the white horizontal lines inside the transport buttons and several other areas.