Could be a 'user account' issue. Remember each user account has its own LW preferences folder. See
http://www.gnutellaforums.com/connec...t-connect.html & try out those methods for the other account.
I have no idea what SP3 did, but perhaps increasing security a little more like VISTA which almost requires Admin for everything.

A copy-cat attempt at what Mac OSX does, however they (windows) are probably struggling with doing it properly & with ease of the user considered also.