WPMU upgrade 2.9.2 -> 3.0 admin login problem

and Create a Network -> Step 3 Allow Multisite instruction:
# Add define(‘WP_ALLOW_MULTISITE’, true); to wp-config.php file

This step is not needed, and is also not listed at all in the instructions to follow. You are already running a network.

Likely this is part of the problem.

Are you also an admin on the rubys blog?

and Create a Network -> Step 3 Allow Multisite instruction:
# Add define(‘WP_ALLOW_MULTISITE’, true); to wp-config.php file

ok – removed that and still having the same problem

Are you also an admin on the rubys blog?

Yep

Go to the Dashboard and look under My Sites. which one is listed as your primary site?

Under Dashboard -> My Blogs
Primary Blog is rubys.erckhotels.com and it’s the only blog listed there.

and it’s the only blog listed there.

Well, there’s the problem. If you;re the Super Admin, the main domain needs to be listed there as well. Can you see the super admin menu?

Have you disabled *all* the plugins, including the mu-plugins?

Can you see the super admin menu?

No

Have you disabled *all* the plugins, including the mu-plugins?

Didn’t before I did the upgrade

Go look in your database, find the wp_sitemeta table (via phpmyadmin).
Look at the site_admins table. It will show a username. Are you logging in with that username?