Patrick, You haven't mentioned the format of DVDs you're using. I believe that the general consensus is that DVD-R generally has better compatibility with DVD video players than DVD+R. It could be as simple as this.
Also the semi-conductor lasers used in DVD players tend to lose power over time, and while there is compensating circuitry for this, eventually they reach the design limits. We have had a few PC-based CD/DVD-ROM drives and a regular DVD player that simply would not read marginal disks any more, despite lens cleaning. Home burned DVDs always tend to not be readable before commercial pressed media in this situation. Regards, Martin martinvisse...@gmail.com -- SLUG - Sydney Linux User's Group Mailing List - http://slug.org.au/ Subscription info and FAQs: http://slug.org.au/faq/mailinglists.html
