I use Hudson with the included Winstone container ('java -jar hudson.war') on
Windows XP (from the command line, not as a service).

When I update Hudson to a new version, Winstone apparently ignores the new war
and still uses the old one from the temp directory (C:\Document and
Settings\myuser\Local Settings\Temp). Replacing means of course: shutdown
Hudson, replace the war, restart.

This can be verified by the version number in the bottom right of the web page
http://localhost:8080/ , which doesn't change.

In order to activate the new one, it is necessary to remove the directory
C:\Document and Settings\myuser\Local Settings\Temp\winstone , which contains
the extracted war.

Version details: The first one, 1.184, remained active even though I replaced
the war successively with 1.185, 1.190 and 1.193.