Just checked -- HTTrack destroyed 3 directories total 
(about 50 megs, or otherwise the better half of my 
day's downloading).

I think it's becaues the server is giving "Error 302: 
OK" messages.  What it means to say is that the file 
is ok and doesn't need updating, but instead HTTrack 
is thinking the files are bad and killing them.

the URL in question is <http://kuni.zone.ne.jp>, with
"+*.png +*.gif +*.jpg +*.css +*.js -
ad.doubleclick.net/*
+home.att.ne.jp/*
+*www5c.biglobe.ne.jp/*
-*/cbbs/*
-*/*bbs*/*
-*/index/*"

as the scan rules.  The server  that all the files 
that are being destroyed come from is home.att.ne.jp.