This really is a mystery. By the way, LW's Prefs have been known to revert to default on odd occasions for some people (else they accidently pressed the default button in the prefs.) But if you've deleted your prefs, I presume you then reset them anyway. I might see if I can get the attention of somebody else on the forum to have a look at this. In the meantime see these 2 threads:
http://www.gnutellaforums.com/showth...5&pagenumber=1 (1st post only) &
http://www.gnutellaforums.com/showth...threadid=27036 and perhaps this one also
http://www.gnutellaforums.com/showth...5&pagenumber=1