Hi Bilbo and Welcome to the forum.
While I have never attempted a a long movie like this in Studio.It could be that, there is a transition or image that Pinnacle doesn't recognize. Or are you trying to copy material and edit from a DVD Movie?
The other thing you could try is breaking the length of the movie down into 3 or 4 parts and render separately like parts 1,2,3,4. Save as say MP2. Then with a DVD Video converter programme you can join them all together and burn to DVD.
Hope this helps