The current -beta release fixes a major bug (which was 
introduced in 3.30-beta-4 or 5) which is causing infinite 
loops when encountering query strings such as
a href="?foo"

A problem with broken keep-alive implementations has also 
been solved (servers which claim "keep-alive" but which 
disconnect just after the first request..)

Please upgrade your httrack version if you used a previous 
3.30-beta release, thank you!