You didnt answer my question...but I assume from your last post that when using an Intamin Hyper coaster, and having the track go from quad to bi rail, you get that?
BTW I just took a track and went from quad rail to bi rail and it worked fine.
Just turn off the shadows, otherwise, load the track again, maybe you might have touched something while it was loading, that happened to me one time. but it's still an NL bug however.
GRIM, I just took the boomergang that came with the update, I alternated from single to double spin twice and didnt get any weird shadows. Can ya be more specific or perhaps, send me the track that gave you those shadows?