For some reason, permission to reply to messages has been denied to me. I've gone through all of my personal settings (profile, etc.) to see if there's something I need to toggle to allow this, but I can't see anything.
Probably the next step would be to have another user log in and see if they can reply to a post so that you can discover if the problem is just with me, or if its going to affect all new users.
The fact that you reply is not surprising because as admin you have the highest level of permissions possible. I might suggest you take a look at the section where permissions are granted to users both universally, and/or on a per user basis. Maybe that will lead you to the solution.
I do, however, how have this song going through my head:
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