Assigning any access other than "View" in content types results in 403 error [#1405378]

Hello,

This is my first bug submission, so hopefully I get the details right.

I recently installed Drupal 6.22 on a shared web host, and have installed the Content Access 6.x-1.2 and ACL 6.x-1.4 modules. I am trying to grant edit/delete access to all users for the forum content type. When I tick any checkbox in the Access Control->Role based access control settings other than "View any content," the submit button generates a 403 forbidden error.

Submitting the form with only "view" access seems to work (I get the green "Your changes have been saved" message), it's just edit and delete checkboxes that throw the error on submit.

I've been able to successfully administer every other part of the site without encountering the 403 error, so I don't think it's an issue with the drupal install. It could be that my shared host has a weird collision with .htaccess needs for this module, but I'm not sure how to track that down.

Of course, I could just be missing something obvious. In a few hours of googling, I was unable to find anyone else with this issue.

Let me know if you require any more specific info. I hope someone can help. Thanks!

Dan