When I logout from my WP install now, I'm getting that "...embarrassing..." page.
I haven't, to my knowledge, changed anything in the wordpress files (php, etc) on the server.
The only thing that could have changed are some of the contents of the fields in the database.
I have been experimenting (with out much success) with the theme-my-login plugin, trying to get the New User/Register page to work. I have used the Preview button a few times on unsuccessful coded pages, but that's about it.
Any suggestions on how to remedy this will be greatly appreciated.