> I have just come across this problem recently.  I am
> mirroring a large intranet site (via commandline)
> where most of the images are in the /img/
> directory.
> 
> Here is the command I am using:
> httrack <http://intranetsite/> -O "C:Documents and
> SettingsUsernameDesktopHTTrackWebsite" -F
> "HTTrack/3.0x" -A500000 -#L500000 -%s -n -t -p7 -%l
> "en, *" -%w -%u -o0 -q -s0 -I0 -H0 -f2 -%f0 -#f
> +*.png +*.gif +*.jpg +*.css +*.js -*.exe -*.zip

I've frequently seen this with 3.32 with update hack (-%s) set.
Remove the -%s and force an update -ic2 (--update)