I think it might be a Joiplay rendering issue, even if I have the “gl3” option checked before hitting Play it happens. I think you might have to turn Compatibility Mode on? (I remember that had fixed your other game after I reported a similar bug there, so it may be worth a shot!)
OPP has run in Compatibility Mode from the beginning, I’m afraid. I only tried other modes on DoB to try to get a fog effect working, before switching it to Compatibility Mode as well.
