I triple checked this and when I do the upgrade from 2.2.7 to 2.2.8 the posting ability in the down line sites disappear.
Under Post the next label is posts which lists all the current post and lets you add a new post. Well with the 2.2.8 upgrade that option completely disappears and people can no longer post.
Then I restored the copy of 2.2.7 that kept and boom they were back. I then tried 2.2.8 again and they disappeared again.
Now I have 2.2.7 back and everything appears normal concerning this topic.
I think you folks should check this out