Songs purchased on iTunes won't play on iPod

Yesterday I created an account for my son on iTunes. This was so I could give him an allowance to download his own songs. He purchased two songs and they downloaded fine to his iPod. The iPod showed the songs and artwork however the songs would not play. The iPod would just skip over them. He has an iPod video 30GB and my laptop is a Toshiba running Windows XP and iTunes 6.0.4.

I tried loading them onto my iPod nano with the same result.

I then searched the web and discovered many people were having the problem, but it seemed like nobody had found the solution.

I tried doing the 5 R's APPLE recommended to no avail. It was a very frustrating day.

Around midnight, I found an obscure statement on the Apple forum recommending deleting a file under the "All Users" setting. Here is the link and text:

"If that doesn't work, try this...
1) Delete the SC Info.sidb file as documented in http://docs.info.apple.com/article.html?artnum=302386.
2) If the issue persists, again try recrating the iTunes Music Library as described in http://docs.info.apple.com/article.html?artnum=93313
If this works, please post back for some more info and what to do with the files you copied.
btabz "

I think the key was deleting the SC Info.sidb file. This is something Apple needs to acknowledge and post. It could have saved me several hours.