I'm baffled by this issue on my new site. I have double checked permissions to verify that authenticated users can post so I'm just getting that out of the way first off.
However, what is odd is that each node (where I rely off of the default Drupal node template, and those in which I have created a custom template) has a "Login or Register to Post Comments" div and appropriate links, however, when I login as a test user, there is no comment form.
I'm not sure where to go from here, as even my Admin account cannot see the comments form.
Also, all comment settings are set to "Open" for all content types and individual content postings.
I have rebuilt the permissions as well, just in case. Nothing has changed.
I happened to remember that I had previously posted a test comment on one of the pages, and now I can't see that comment, even if I go through the admin panels. I can see that there is a comment, but I cannot see the comment itself.