In case anyone's interested, I have the same problem and I cannot get it resolved at all. I have got on tech support on the phone and I have to say it's painful and also fruitless after two weeks.
Personally, my feeling after wasting a huge amount of time (as well as a lot of lost revenue by not being able to create the DVD), is that I'm for burning it publicly, or at the very least asking for my money back.
It simply can't do what it's meant to do. It keeps hanging at different places on different clips with no rhyme or reason to it.
I am, needless to say, extremely disappointed and more than a little disgruntled at the level of support I supposedly paid for. If, in the future, I do get it fixed and tech support does come through I will willingly come back on here and sing praises to all concerned.
However, I don't feel very confident about that right now.