Routing issue

[eluser]danmontgomery[/eluser]
Is there a reason you have nothing after RewriteBase? If your index.php is in webroot you should leave that value as / or remove it completely. There's also really no reason to be mixing rewritebase with absolute paths in your rewriterules (I realize this is something that comes from the wiki)

You can also try removing the ? after index.php.

Have you looked at apache's error log?