[i've had the same problem - will not burn but does create the iso file.
Also, I've had problems with burning any kind of Video Disk.
On one of the forum questions, NCH folks suggested that I use different media (i.e. a different DVD). Well, that did not work either.
The bottom line is Express Burn apparently does not work well when burning Video DVDs. There are some huge problems. (I even got hooked up a new DVD/VCR combo out and it did not make a difference.)
All of the disks failed.
I downloaded Nero Trial and it worked the first time on BOTH a Video CD (played just fine in my newer DVD player); and, a DVD (that played in both DVD players.) Right now there is a special that makes Nero affordable and there is a free piece of software with it.
Some of the NCH programs work OK to well. Express Burn does not!
Clifton
PS - Preparing to try AN's diagnostic program later on; but, am disappointed in Express Burn thus far.