Here is an update to my situation.
I tried unchecking the shadow file box. It made no difference.
I cleaned up my disks and deleted cache and temp files. It made no difference.
I checked my disk and it was alread 100% defragged due to my scheduling of same.
I re read the post from the tech support people. They advised that I had to uninstall any other DVD burning software. I decided not to do that quite yet. In fact I had a Samsung OEM version of Nero9 which came with the 2 DVD burners on our church machine. I wanted to make sure I could burn a disc with that at least. I dropped an mpeg2 file I built on PD9 onto the timeline and put 4 chapters and a title in it. The disc burned perfectly.
As I was installing Nero9, I noticed that the disc made mention of a way to upgrade the firmware on their burners. My home machine does not say it is Samsung on the front of the drive, but upon visiting the web site, I discovered that my home machine's drive is, in fact, an oem samsung drive. Software was available free on the web site to upgrade the firmware. It is called Live update. I installed that software and it took only a few minutes to upgrade the firmware on the drive. It is, BTW, about 5 months old. I rebooted to finish the firmware upgrade process
I then started PD9 and unchecked the box that allows parallel processing and hardware acceleration through my CPU and graphics card respectively.
I built a short program consisting of H.264 (mp4) files totaling 234 mb in length with 4 chapters and a scrolling title.
I went to the Create a disc module and proceeded to attempt a burn. I did not pre produce it. The disc burned perfectly.
I then went back through the process again each time re checking the parallel processing and hardware acceleration boxes. Again, the discs burned perfectly. Although I haven't done it yet, I suspect I can re check the shadow files box as well.
I will also be visiting our church later on this evening to upgrade the two burners on it as well. Unless I post otherwise here, it is a success.
I have never in my experience had to upgrade DVD burner firmware. It is entirely new to me. In my book, that eliminates problems with my Asus M4A88 motherboard. It also eliminates problems with Win 7 and with my Quadro Graphics card.
I have noticed that even more people are having this same problem. I saw it on another similar thread and will post on that one too. Hopefully, it will help others. Upgrading the burner firmware may have been mentioned here, but I haven't seen it. If this is an issue that needs to be addressed by a number of PD9 users, it would be nice if Cyberlink would put out an advisory to that effect.
Thanks for all the help and suggestions on this board.
Don Williams a.k.a. Librarian