@LMc,
This is a bit of a long shot but is a fairly quick test – can you try disabling Hardware Acceleration and see if this allows the browser to open properly? To do this, you’ll need to make a desktop shortcut with some slight alterations to the Target path. You can use the following instructions to do this:
Note that the steps are the same on Windows 10 here.
Note that the steps are the same on Windows 10 here.