Firefox 3.0 is what I am using and the same thing is happening to me. This is why I continue to pay for Mr Poster. If this is still a problem tomorrow I will forget the nice looking listings and list with Mr Poster
What always bothers me about the online version is that there is never anything on the website which tells you if there is a problem. If there was, we wouldn't waste our time trying to list items during this kind of a downtime