Unable to add comments

Ok, so this is a bit weird, don’t know if it’s a bug in ArtHelper or a problem with the latest iOS update, or “operator error.” I go into a community, see a post, tap to add a comment and no box appears at the top of the comments or the bottom.

So I logged out and back in again. Was able to respond to a post. Hurrah! Problem solved. Uh. Only not so fast. Tried to comment elsewhere, no comment box to be found. Thoughts?