Here is an update. Not only is the scrollbar thumb missing, but when I press the menu, say "File" or "Edit", the pop-up menu is all garbled. I can see the text, but do not see the selected item. Also, there is a big white garbled border around the pop-up menu. I was not able to get a screen-capture of the window and so have attached a photo showing the problem.
Here is an update. Not only is the scrollbar thumb missing, but when I press the menu, say "File" or "Edit", the pop-up menu is all garbled. I can see the text, but do not see the selected item. Also, there is a big white garbled border around the pop-up menu. I was not able to get a screen-capture of the window and so have attached a photo showing the problem.