We are using WordPress 3.1 and just recently upgraded to that version. We are using SQL for our database, so that is why we are on 3.1.
When we did the upgrade, we had a few issues but I have been able to fix all but one.
We have Pages (6 of them) in place to create the horizontal menu on the page. Since the upgrade, in the WP Admin, it shows we have 6 still but none are listed. It also does not show up on the site itself.
This is NOT a theme issue. It is not correct in the WP Admin itself. I have gone back to default theme, removed all plug ins, changed the permalink settings back to default...none of this worked.