Have I been banned from replying?
We've had a small number of reports on this issue but have not, as of yet, been able to reproduce it. I would ask for further information here, but since you can't reply that's clearly not helpful. If you have any details that you believe may be pertinent, please send them to email@example.com
(For tips on what may be useful information, please see http://www.chow.com/topics/797149 )
Shot in the dark here, but many web browsers will display the intended destination of a link when you hold your mouse over it. The URL displayed for the reply link should be the same as the URL for whatever thread you are reading, but with a # at the end. Is that the case for you?