1) Always post the ACTUAL command line used (or log file line two) so we know
what the site is, what ALL your settings are, etc.
2) Always post the URLs you're not getting and from what URL.
3) Always post anything USEFUL from the log file.
4) If you want everything use the near flag (get non-html files related) not
filters.
5) I always run with No External Pages so I know where the mirror ends. I
always run with broswer ID=msie6 as some sites don't like a HTT one. I always
run with Attempt to detect all links.

> I used the URL capture proxy method in HTTrack for
> logging in to a forum that requires login But EVERY

Did you get the captured message? (or #1)

> page on that forum beyond the main page requires you
> to be logged in, or else it presents you with the

Then something is wrong. Did you filter out the log-out url (if any)?
> login page. Problem with this is it is SUPPOSED TO
> store a cookie with the login info, so you don't
> need to login manually every page you view time.

Exactly how is DOES work.

> This cookie behavior that works FLAWLESSLY in
> Firefox, and other webbrowsers. But it does NOT work

IRRELEVANT.

> in HTTrack. That is to say, HTTrack does NOT store
> login cookies.

It certainly does just that.

> Please fix this or help me find a setting to change,
> so that HTTrack can fully download this forum I'm
> trying to mirror. Thanks in advance for any help you
> can provide.

There is NOTHING to fix. 

Y O U   D I D   S O M E T H I N G   W R O N G !!

Stop blaming others for your mistakes. The First thing you should do is assume
that you did something wrong. Then if you can't figure it out, ask a question.
The Last thing is to blame the SW. You are out of wack.

HTTrack Help: Authentication
<http://httrack.kauler.com/help/Authentication>