WordPress MU

I'm upgrading WPMU 2.6.x to WPMU 2.7 trunk (r1617) on a development server. When I make the switch, I can no longer log in to the back-end.

Things I've tried (& most combinations of options below):

• mass-deactivate plugins via WPMUPluginCommander (runs out of memory or time)
• mv plugins/* plugins_disabled/;mv mu-plugins/* mu-plugins_disabled/
• upgrade to WPMU 2.6.5 first

I've manually inserted a new md5 password into the database, but it gets corrupted as soon as I login (logging in with a password *updates* the password with what appears to be a new salted? MD5 hash).

NOTE: The password/auth may be salted, and I haven't figured out a workaround for that yet.

NOTE2: The front end appears to work fine with all my plugins (except wordpress-admin-bar), I just can't log in to the back-end.

BTW, on the login page, the link attached to the WordPress logo went to:

http://domain.com/file-system/path/to/site

instead of:

http://blogname.domain.com/

In addition, when clicking Forgot Password the emails included similar links:

http://domain.com/file/system/path/to/site/wp-login.php?action=rp&key=xxxxxxxxx

It looks like I had an incorrect value for PATH_CURRENT_SITE. Fixing that resolved the PATH problem.

define('PATH_CURRENT_SITE', '/' );

...and also appears to have resolved this login issue.

For completeness:

The user for whom the Forgot Password function was used is sent this email:

Username: yyyyyyyyyyy
Password: xxxxxxx
http://domain.com/wp-login.php

Upon successful login, however, the user is connected to their 'primary' blog (http://primary-blog-name.domain.com/wp-admin/).