Dafydd,
OK-- using the same "old project" (4405 of 4700mb). I removed the end to the project and tried to burn to DVD-- I did this several times, continuing to remove pictures and videos from my project, until I only had several pictures left (i.e. about 150mb of 4700mb). Each time, I would get the same error message- "Burning Unsucessfull (1) THe DVD Video Folder doesn't conform to DVD Video Spec's Requirement."
I then rebooted, opened the same 4405mb of 4700mb project, removed most of it in "EDIT"-- down to 505mb of 4700mb. Using the same blank DVD, it burned fine. So, it appears after I get the "Burning Unsucessful" error message, it doesn't matter what I try to burn from the same project (even removing most of the pictures/videos), I will get this error message. But, when I close the PD, reboot, and BEFORE getting the "burn unsucessful" error message, I can remove a bunch of my project and it will burn sucessfully. I thought perhaps this would give you a clue to what may be causing my problem???
Thanks for taking the time to review!!
Mark