Probably the wrong heading – I run two SP forums and checking one against the other I find that
Dashboard – Forums , the following sections have suddenly disappeared from the Menu — Plugins , Themes, Toolbox.
How do I restore these or is it a complete re install ?
Capabilities – i.e., what you as a forum admin can see and work with – are defined in the forum admin > Admins > Manage Admins. So – if you are a full SP admin then you should be able to tick the caps against yourself to get the menu items to appear.