The easiest way to explain this problem is to give the following set of screenshots (I've linked rather than embedded them because they are rather large):-
http://www.andperry.com/images/xataface_contents_list_1.jpg
http://www.andperry.com/images/xataface_contents_list_2.jpg
http://www.andperry.com/images/xataface_contents_list_3.jpg
Basically the browser window was being stretched to various sizes. As you will see, in the middle one the contents list is all over the place. Have tried it on IE8 and Firefox 6 - problem seems the same. Hopefully it should speak for itself.
Thanks,
Andrew Perry.