Trying to burn DVD- Nero just disappears but

is apparently still in background although it is not doing anything. I am trying to burn a WIndows Photostory wmv file using Nero Create Your Own Movie (DVD) option. The transcoding begins but somewhere in the process it just disappears from my screen. I have let it run over night to see if was actually doing something in the background but it never renders the DVD. When I close completely out of Nero and then try and reburn as a new project again it says Nero is already running. When looking at running processes it is still apparently open but not doing anything.

I am getting the same problem on two different computers running Nero 6. I have tried different DVD discs as well. I have screwed around with this for 5 days now. Any ideas what gives. Thanks for the help.