DOpus 12.12 opens and immediately closes (64bit version, Windows 10)

Issue began 3 days ago. Installed latest beta 12.12.4 and problem still there. However I choose to open a lister, it appears on screen for about 1 second and then crashes. I have installed a couple of things recently which I could perhaps uninstall and see if that fixes it unless someone has a better idea.
Ken Ford,
Wellington Point QLD.

If it seems to coincide with a recently installed tool, testing with that removed again is definitely worth a try.

These two guides may also be relevant:

If crash dumps were created, please send them to us and we'll see if they point to the cause.