Greets:
Well, I reinstalled MU v548 this morning and I've been hitting some of the bugs reported here. I'm on a terminal where I can install an editor so I can track them down locally.
To fix the "I didn't get the admin email with my password" problem, you need to do 2 edits in wp-inst/wpmu-functions.php.
in function wpmu_create_user
change: $user_id = wp_create_user( $user_name, $email, $password);
to: $user_id = wp_create_user( $user_name, $password, $email);
This unfortunetly will brack activation so you need to do the second edit:
in function wpmu_activate_blog
change: $user_id = wpmu_create_user($user_login, $user_email, $password);
to: $user_id = wpmu_create_user($user_login, $password, $user_email);
It looks like when they were lying this on top of the WP code, someone got backwards. :)
Hope this helps,
-drmike