Added this module and Dashplayer stopped working. An old issue for the Drupal version 5 talks about GR breaking services, but part of the fix requires changes to the Flash source.

It looks like the error occurs because GR returns a 301 to a request like this.

POST http://site/site_dir/?=services/amfphp

Disabling the module the same POST returns a 200 and the player works.