Problem seems to be option "OverheadScrollSpeed". When I run chobby it appears in the springsettings.cfg with the value of 50, even if I set it to 0 or delete it before. If I start the engine by itself, without chobby or the option set it works as before. I can't find where this is set (also engine default seems to be 10, so no clue where the 50 appears).