How to decipher

How do I track down the offending permission? I have a role who should be able to create content of type 'mycontent', but gets an access denied error. The site is in Open Atrium.

My report gives me:

User Permisions:
[create mycontent content] => 1

Backtrace:

Array
(
    [ 2: drupal_deliver_page()] => Array
        (
            [file] => includes/common.inc:2612
            [args] => Array
                (
                    [0] => 3
                    [1] => 
                )

        )

    [ 1: menu_execute_active_handler()] => Array
        (
            [file] => includes/menu.inc:542
            [args] => Array
                (
                )

        )

    [ 0: main()] => Array
        (
            [file] => index.php:21
            [args] => Array
                (
                    [q] => node/add/mycontent
                )

        )

)

From this, how do I find the permission to change?