You are proobably not doing anything wrong. It is more likely that your DVD Players have a compatibility issue with DVD+R media. You can check this out at http://www.videohelp.com/dvdplayers.

As a general rule you will have fewer compatibility issues with DVD-R, but you can check this at the same site.

Good luck

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IBM A51p with 160Gb Boot Disk, 160Gb external Firewire Disk, 2Gb Memory and a super duper sound card, 17\" TFT Monitor etc etc etc
Sony TRV33e : Sony TRV310e : Canon XM2
ULead products mostly including Mediastudio Pro (V8.0), Video Studio 8, Movie Factory 2.0, Premiere Elements

Remember, there is always more to learn than there is to teach.