the white screen bug is sort of back again : when opening up the gui from systemtray , it shows the " white screen " for 1 or 2 seconds , before switching to the normal screen.
If Repair doesn’t fix the problem, try the following:
If your Avast settings are not the default settings and you want them restored after the Clean Install, follow this before removing Avast. https://goo.gl/TXjM7h Clean Install of Avast: https://goo.gl/4Ptzkf
If you need additional help with the Clean Install, watch this: https://youtu.be/p-h3myRD51A