Rich,
The attached screen shot it what I'm seeing on my screen, if the proportion of text area to right side margin stuff is same as what everybody else is getting, I can live with it.
Jerry, if you do not have your browser window maximized (filling the whole screen) try that. If you are not running it maximized and prefer not to run it that way, click and drag the side of the browser window to make it larger horizontally. The text area will enlarge with your window, thus making it wider.
If neither one of those solutions helps, it may be related to monitor size and your display resolution settings. Look around page 11 in the "Questions? Problems?" thread. There was a discussion about this problem there.