If you followed those directions exactly it should work correctly as is does for me. Just a few things to note: under the SMS Menu and under "Device settings...", make sure the option "Disable CD/DVD" has a red X and not a green check mark. And also, when you place your made DVD-R into a regular DVD player or when you play it with the PS2's DVD player you should get this screen:

If you get that screen and you can see your audio or video files on the disc in your PC, then the disc should be fine. Another thing to try is to place a regular DVD video in your PS2 while SMS is running to see if it reads that. If not, maybe your laser needs cleaning. Hopefully this helps you out.
