It doesn't take a long URL to cause the problem. A long "word" can do it also. For example, the 18th message in
http://www.flyertalk.com/forum/Forum1/HTML/005353.html
has a "word" made up of many many characters without a space character. This forces the window to be very wide, to include the entire "word."
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Middle_Seat
Edited to add: I emailed the author of the offending message to ask him to break up the word "...tumitumitumi..." somewhere with a space character. After he does that, the wide-window problem should go away.
[This message has been edited by Middle_Seat (edited 10-05-2001).]