> HTTRACK is a great program, but some sites, like
> <http://www.monolithicdome.com> and
> <http://www.visionfreedom.com>. are unreachable.  Why is 
that?>  After all, I can see them in my browser.  I have version
> 3.23; does version 3.30 fix this problem?
This is because these sites are hosted in other domains 
(such as <http://sky.prohosting.com/twenty20/>) ; using an 
invisible frame (that is, <http://www.visionfreedom.com> is 
only a single html page with an embedded frame pointing to 
<http://sky.prohosting.com/twenty20/>).

Either use scan rules (options/scan rules) or start from 
the "real" locations.