Ok...moving from WPMU 2.9.2 to WP 3.0 is NOT fun. :)
I did all the proper backing up of files and data, so nothing is lost forever. I deactivated all my plugins, and I deleted all the old files except for wp_config and a couple of others. I have a previous test site of WP 3.0, so I used that wp_config.
I changed all my wp_1_*datatable names* to just wp_*datatable names*. I ran the upgrade database program as I tried to access my Dashboard, and my site is back up, minus plugin functionality.
The problem is I can't login to my Dashboard now. I get this:
You do not have sufficient permissions to access this page.
I tried resetting the password, nothing is working.