I don't use any of the programs in the Wikipedia list - in fact I'm surprised to find how few OpenGL programs I use.
I ran lots of things and checked for each whether it used an OGL dll. My graphic and photo editors which I thought used OpenGL turn out not to.
The CAD system I have uses OGL but I'm almost certain I haven't used that since my problems began and (of course) it works perfectly now.
I feel disinclined to back out the graphics driver to recreate the problem, but admit my perception that "everything else worked" turns out to be largely irrelevant and possibly false.