Allow all OG members to view/edit all content
Organic groups controls (Organic Groups Global Permissions) are different from your site permission, roles etc. To allow authenticated users the required permission, configure the organic groups global permission:

Navigate to: Configuration -> Organic Groups Global Permissions (drupal/admin/config/group/permissions), here you will find the controls over who can view and edit nodes and fields on your group pages.

Few reference for the organic groups permission:
http://vimeo.com/32398425
http://vimeo.com/32398425
https://drupal.org/node/2014929
https://drupal.org/node/2014793