I have sometimes the same problem = it depends on which PC I work. I think it's a problem in the configuration of the PC or the browser - but I have no clue what to do in order to solve the problem (pressing shift+reload often helped - but NOT always).
edited to add: just found the thread
http://www.flyertalk.com/forum/Forum72/HTML/000662.html in which the same problem is discussed.
[This message has been edited by LH738 (edited 03-09-2003).]