Horrible problem with CUSTOMPRESS when posting - I can't publish or update

I'm freaking out so please bear with me. I have created a post type with a number of custom tags. When I complete a post and go to publish it, I get the following error:
"You are not allowed to edit this post."

I have looked at the following:
- https://premium.wpmudev.org/forums/topic/erroryou-are-not-allowed-to-edit-this-post

- https://premium.wpmudev.org/forums/topic/cpt-created-with-custompress-wont-let-editor-level-users-no-role-editing-create-new-content

Niether seem to have a definitive solution. I have updated everything and am not using anything imported.

Thank you for your time in advance. WPMU members are superior people indeed!