Very choppy playback of burned disk on Mac

I also posted this in iDVD, but I am putting it here also in case it is a hardware problem that one of you have seen before.
I created a project in iDVD 6 consisting of a single menu with several slideshows using one of the included themes. After burning to a DVD-R media on my first generation MacBook Pro, the disk won't play back correctly either on my computer or the Mac Mini in our house. It did seem to play on a standalone DVD player.
On the computers, it proceeds very, very, very slow and choppy, while you can hear the DVD drive head constantly moving and pumping rapidly. I re-burned it several times on different brands of DVDs, all with the same result. I also created a disk image and burned it through Disk Utility at a slow speed, again with the same result. The iDVD settings are 4:3 ration, NTSC and "Best Performance" (although one time I tried "best quality" with the same result.
Any thoughts?
Thanks,
-Tom

Yes. I have also discovered since my last post that if I stop the DVD, wait until the drive stops reading without ejecting it, and then restart the DVD, it works fine. And yet it does this same thing every time. I've tried changing the theme and certain aspects of the main menu and re-burning it. I've tried burning it through Disk Utility. I have tried different brands of DVD's. And the playback problem happens when I play one of the burned DVDs on any of the three macs in our house. And in each case, if I stop it, wait and restart it, it works fine.
Odd.

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I apologize if this is already answered somewhere. I searched but couldn't find this problem.
I created a project in iDVD 6 consisting of a single menu with several slideshows using one of the included themes. After burning to a DVD-R media on my first generation MacBook Pro, the disk won't play back correct either on my computer or the Mac Mini in our house. It did play on the standalone DVD player.
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This page didn't make any sense to me. Were these posts by people installing the update or removing it? That page seems to refer to the update that happened last night, which seems to have started my problems. Can you elaborate on this?
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