If you see a lot of white space to the right ---->
between the edge of the "Post a Reply" box and the box containing the message (the Reply box isn't using the whole space) then I fixed that problem so it must be your browser is caching the old style sheet. Access the site from THIS LINK and see if it changes. If it works there then dump your browser cache. In Internet Explorer 7: under Tools menu select Internet Options then on the General tab click the [Delete...] button in Browsing History. It might be a good idea while there to also click the [Settings...] button and make sure it is set to check for new pages automatically or at least not "Never".
If there is no extra white space because the screen is just very, very small then I'll have a fix for that later today.