looks like they can't handle the load, damn they fixed it. http://www.fawzma.com/2008/10/02/think-neverblueads-made-a-booboo/
Come on anyone can have this kind of problems. Servers and softwares are not humans. They dont work properly every time. This is not a big deal i think but if this affected affiliate commission tracking system this is a problem.
If it was google, this would be front page news and people would be freaking out. As for lost sales, don't know, things were back to normal before I tested any links.
Google is an international company. Works for everyone in the world. Neverblue is just a company for affiliate marketers.
Computers are much better than humans when doing multiple tasks and calculations practically all at once. As always computers can go wrong, but still humans can also make mistakes.