I am using Justin Tadlock's Members plugin 0.2.4.
I have a custom user role "Author" that I am granting permission to post a Custom Post Type "blogpost". The Author can post and edit the CPT blogpost however cannot add categories as the check-boxes are grayed out.
Others have reported similar problems in his plugin's support forum over a year ago but the the user's question seems unanswered and is now closed.
I am aware that enabling the "edit_posts" capability fixes the problem however gives the custom user role access to all post types which they should not have and is very bad.
Some have tried creating custom taxonomies to work around this, which reportedly worked for their custom user role. However, that does not work for my site as I have built it primarily using the default taxonomy provided in the core and I am quite far along in development.
Any help explaining to me what I have done wrong, or how to better configure Justin Tadlock's Members plugin would be very greatly appreciated.