I just upgraded from 1.4 to 1.6, and I’m getting this on my WPMU installation:

WordPress database error: [Table '******.wp_1_users' doesn't exist]
SELECT post_date, guest_name, user_id, user_login FROM wp_1_sfposts LEFT JOIN wp_1_users ON wp_1_sfposts.user_id = wp_1_users.ID WHERE topic_id = 1 ORDER BY post_id ASC LIMIT 1
WordPress database error: [Table '********.wp_1_users' doesn't exist]
SELECT post_date, guest_name, user_id, user_login FROM wp_1_sfposts LEFT JOIN wp_1_users ON wp_1_sfposts.user_id = wp_1_users.ID WHERE topic_id = 1 ORDER BY post_id DESC LIMIT 1

For now, I’m commented-out everything in the sf_render_new_post_list_user() function to hide the error. I’m not sure if this is something that’s just specific to my installation, but I thought you might want to know about it.

On the basis that with this small change it does rather unexpectedly seem to run under WP MU, I'll try and make this automatic. I wish I'd thought of doing that in 1.6…

On the list! 

Fixed it……….screamed to early