We recently upgraded to PHP 5.3.2 and Apache 2.2.15 and since then have not been able to get EE working properly. When going to the admin or other portion it seems to have an issue with redirecting and trying to download the index.php as a file?
PHP is working any other .php page in the directory works, index.php is set as default page as well. This is with EE version 1.6.8 and 1.6.9.