So the result is... still a no go. New things I have learned. It works in User A (my user login, no admin privileges, or anything special), it works in Administrator, it works in newly created user accounts, but it still CTD in User B, even if that user is given all the same privileges as the Administrator, even if all display settings are reset, and all *.ini files are copied in or reloaded. I am stuck. I think I am giving up for now, unless anyone has any other suggestions.