XP Publisher: *** Couldn't log-in. Try again. *** Error Message

[HardDriver]

My fresh and un-hacked Coppermine install is bridged to my un-hacked vBulletin forum.  Everything works great, except for the XP Publisher utility.  After following the instructions in xp_publisher.php and downloading and installing the registry update, I am unable to actually log in to my gallery installation.  I have tried several different logins and have triple checked the passwords, but nevertheless I only see "*** Couldn't log-in.  Try again. ***" displayed in the XP Publisher window after attempting to enter a username and password.  Personally, I feel this may be a bridging issue, but I believe others have done this successfully and there are no other threads on the issue that I can find, so I posted my question here.  I wish there was a more detailed or informative error message that I could post for you guys, but that's literally all there is.  Is there something I am missing?  Anything I should check that could be causing this problem?

[Nibbler]

The password authentication in the publisher does not work when bridged, you need to be logged in already using IE so that you are recognised automatically.

[HardDriver]

Unfortunately, I have already tried that without any luck.

[Joachim Müller]

You need to use Internet Ecploer - other browsers won't work.

[HardDriver]

Thanks for taking a look at my topic, GauGau, and I must say excellent work on an outstanding piece of software.  In regards to your comment, however, I am using the latest version of IE6 to test these multiple logins with.