Drupal login problem with PHP 5.2
Having recently upgraded to PHP 5.2 on one of the servers I run I needed to throw a new Drupal site together this evening. All was well until you tried to navigate to any page after logging in.
Access Denied was the response on every page. It turns out this is a known issue and is fixed in the latest development release of Drupal 4.7. If you're running PHP 5.2 make sure you download 4.7-dev instead of Drupal 4.7.4.