Quote - Which makes me think that the Max camera gets inside a Vue element in this particular frame....Could you tra,nsfer the camera path from the Max cam to the Vue cam, and render this frame with the Vue cam and see if it renders ok?

Yes, I have made a test with Synchro Plugin for Vue xStream, synchronized the Max Camera01 in Vue, rendered with Vue at frame 413: the result is a good rendering !

I also tried to made another Camera in Max, by moving the camera position and the target position of camera, but the rendering error, in Max, appears in another keyframe as black screen! 
I tried to render this second synchronized camera in Vue, but it renders without problems!

The problem is not an object that occlude the camera in Vue, I think...