Talkthrough

Could somebody talk me through this plugin’s settings? I’ve used it for a couple of years but since I got a question from a user, I discovered that nothing works the way I thought it would (did?).

I have a number of roles, most of them are reading permissions and these seem to work just fine. I also have roles for writing. I have a number of categories and each one has a writing permission. A user with that permission should be able to write, edit, etc. posts with that category.
I also use the Timely Event calendar plugin and I use the same categories for events. A user in writing group A should be able to write/edit posts and events.

Now this filtering on categorie works, but the weird part is: I can’t allow my users to actually post posts or events. I have used the ‘WP capabilities editor’ to try to allow them to do just that, but they keep getting a ‘you’re not allowed to edit this post’ error.

So how do I allow users to actually do what I want them to do, filtered by Press Permit?