e-Newsletter plugin permissions for editors role


We have a problem with the e-Newsletter plugin.

When a user with 'Editor' role permissions for the site attempts to create a new newsletter they receive the following error:

"You do not have sufficient permissions to access this admin page."

If I change the user's role to 'Administrator' they are able to create Newsletters.

In the eNewsletter --> Settings --> User Permissions tab we have ticked all the permissions for the editor role.

The site is a WordPress Multisite, version: 3.6.1
and e-Newsletter version: 2.6.1