Error on save and piblish of draft page

When I hit Save and Publish on a draft page, I get an error in the CMS workflow plugin - looking on Firebug the error is:

"NetworkError: 403 Forbidden - http://example.com/index.php/admin/EditForm"
403//Action "cms_publishwithcomment" not allowed on controller (Class: CMSMain)

Any ideas?

Running SS v 2.4.7 and CMS workflow v1.0-rc4

Thanks
