I recently burned a copy of a family vacation from the camcorder to DVD like I've done in the past. This time it played the first time but when my parents took it to watch it didn't work. Then I tried playing it on my DVD again and nothing happened. This is the first DVD to do this. Could it be just a bad disc? I know there are some problems with playback if you watch it multiple times but I've never heard of a problem where it only plays once. I have a Pioneer DVR-105 and a Sony DRU500AX. Both with up to date firmware. I am using BeAll 1-4x media, which I've used in the past but most of my DVDs are on BeAll 1x media. Any help would be appreciated.