its your permalinks. you need to turn off your permalinks. there are a ton of posts about this exact issue, and this had nothing to do with the upgrade.
i think you have to disable some php flag in the .htaccess. try expertzzz.com and query the forum for permalinks that should get you a few answers.
i think you have to disable some php flag in the .htaccess. try expertzzz.com and query the forum for permalinks that should get you a few answers.
later,
DosDawg