I’m experiencing the same problem.
Just overnight the “Publish” changed to “Submit for Review”.
I’m using 3.0.1.
I cannot Ad new posts, Save Drafts, nor New User. I changed the theme, nothing. Deleted plugins I’m not using. Deactivated plugins, nothing.
When I try to Submit for Review, the post doesn’t get sent nor does it get saved in the drafts…it just switches to the Posts page listing.
any suggestions? I’m stuck. My website is a brick.