works fine that I see on our site here. Your not going to see a comments box if your not logged in remember. So I can only assume your not logged in and you have to view a photo that is not yours.
In the current version of Firefox my photopost pro comment box is stretched just a bit off screen to the right as in the above screen shot. In IE it is fine. I am using Photopost Pro on its own. How can I resize the comment box to fix it in Firefox?
The only picture I see in this thread points to some vb hack interfering with Photopost. Real easy test turn off the vb3 integration and does your comments box appear?