Well,
I guess this title says it all.
"Some programs seem to stop working after you install Windows XP Service Pack 2"
http://support.microsoft.com/default.aspx?kbid=842242
Microsoft KnowledgeBase Article #842242
Article Summary
After you install Microsoft Windows XP Service Pack 2 (SP2), some programs may seem not to work. By default, Windows Firewall is enabled and blocks unsolicited connections to your computer. This article discusses how to make an exception and enable a program to run by adding it to the list of exceptions. This procedure permits the program to work as it did before the service pack was installed.
> My Comment <
Well I guess we'll start to see the list grow. I hope this helps other folks, that are starting to see problems, and want somewhere to go for info, and are not into crawling the knowledgebase.