I've been tearing my hair out for a couple days over this, and it seems it's the Cutaway feature causing the issue.
I'm working on an animation that has a few fade transitions in it. I've noticed several of the fades working sometimes and not others. Never thought to try with/without the cutaway to see if that was causing our problems, but I've just tried and it seems to be the culprit. I'm using the a cutaway feature to look inside a vehicle with a variety of different animations within. All of the fade animations don't work (pop from invisible to visible, or vice-versa, while the cutaway is active).
A second issue is that the objects that are exempt from the cutaway feature display witness lines either at the the intersection of the cutaway and that object, or at an intersection between the object and the other objects being cutaway. This happens regardless of which style of cap is used.
My Keyshot should be up to date I believe: version 8.2.8
I have to hit render on this Wednesday night, and these are serious issues. Any ideas?