It was a personalisation issue. I purged her personalisation for this menu and it worked - thanks Tim Russell and epicorten
I have a user who cannot close or open lines or releases on a PO yet her colleague can. Their security is exactly the same so I don't understand why these options are greyed out for her. She could do it in E9 but now in E10 she can't
Make sure they are an authorized user to change others PO's.