I have upgraded to WordPress 3.1 and found my Custom Fields missing in Add new or Edit Post or Page. How to get back my Custom Fields in WordPress blog?
If your Custom fields are missing in Add new or Edit Post. Just click on “Screen Options” slide button (look for it at the right corner of your screen in Add New or Edit page, just below the L0gout link).
That’s it. WordPress custom field missing problem is fixed 😉