Have you updated to 3.0.7-pl1?
If so did are you using the default theme, or a custom theme?
If it's custom is it up-to-date?
If it isn't up to date.
Check the changed-files..
http://www.ohloh.net/p/phpbb/download?f ... -files.zip
Make the edits for your theme, or go to your theme's topic and download the latest compatible version.