PHP serves blank file when loading from UserDir

Hi. I have run into a problem where PHP serves a blank file when accessing it via an Apache UserDir. PHP works fine otherwise. Eg: http://www.server.com/file.php WORKS FINE http://123.456.789.123/~username/file.php DOES NOT I'm fairly sure it's not an Apache issue because accessing HTML files via a UserDir works fine, eg: http://123.456.789.123/~username/file.html I know that PHP is loaded because when I access a non-existent file and trigger a 404, I get the following in my ServerSignature: Apache/2.2.2 (Fedora) DAV/2 PHP/5.1.6 mod_python/3.2.8 Python/2.4.3 mod_ssl/2.2.2 OpenSSL/0.9.8a SVN/1.3.2 Server at server.com Port 80 Everything else about this configuration works fine except for this UserDir problem. I have a similar configuration, but with PHP4, and it works as expected. Is this a change with PHP5? A potential bug? There are no error messages anywhere (Apache or PHP logs), only a blank page. I've completely exhausted my Google-fu and have failed. I know other people have experienced this, but have yet to find a solution. Help me Obi Wan, you're my only hope! Thanks, -j