I installed a fresh python 2.6.2 on RHEL4U4 (unfortunately, some of us are stuck
back on RHEL4 with ancient Python 2.3, so I had to install my own Python 2.6.2
by hand) and pulled down crew as of 8638:c6483eec6092 (I can see the noted
commit -- 8590:59acb9c7d90f -- in hg log).

I can "hg clone" and "hg pull" from https through my proxy now.  Woo hoo!

However, "hg push" doesn't seems to work -- I cannot authenticate properly.  I
have tried both:

$ /tmp/bogus/bin/hg push https://jsquyres:<MYPW>@bitbucket.org/jsquyres/proxy-test/
pushing to https://jsquyres:***@bitbucket.org/jsquyres/proxy-test/
searching for changes
abort: authorization failed

and

$ /tmp/bogus/bin/hg push https://jsquyres@bitbucket.org/jsquyres/proxy-test/
pushing to https://jsquyres@bitbucket.org/jsquyres/proxy-test/
searching for changes
http authorization required
realm: Bitbucket.org HTTP
user: jsquyres
password: <MYPW>
abort: authorization failed

So it seems like the underlying problem is partially worked around, but not
entirely...?

Is there any further info that I could provide to help?