For what it's worth I just tried exporting all my old (V4) vobs as 3DS, I only had 6, and they all worked OK, so I just don't know why others can't.

Debby, Walther and I are only trying to help too. I am at Renderosity time +9 and Walther +10, so you might look at the times on his posts, and consider just how much he is putting himself out to try and help.