Crashes when using dimensions and entity is not highlighted

I have 2 issues. The first being one that has happened several times in the past couple of months and a uninstall and reinstall has fixed the problem for a short while. The first problem has been any time I would use any of the dimension functions the program would close. It happened again today so I proceeded to uninstall and reinstall as I had done before. Now I am able to use the dimension function but when hovering over an entity it does not highlight and also does not highlight when selected. Another problem after reinstalling is that when I move the cursor the screen flutters and multiple images of my drawing are on the screen. Any solutions for any of these problems?