Hi all. Any ideas about this one?

I burned a DVD of some VHS programs using TMPGEnc DVD Author onto a Maxell 2X DVD-RW that I got as a 3 pack from the FutureShop. The first one played fine. I then did some more authoring to another DVD-RW in the pack but my DVD player won't play it saying disc error. I tried the first DVD-RW and am now getting the same disc error.

Is this unusual? If it worked once, is there something that I can do to make it work again?

I've checked the compatibility list but there isn't much on it for my player.

Thanks for any help