Why is link and unlink grayed out?

I am building a HUD. Somehow when I originally linked the pieces, the order was wrong. This caused my HUD to go haywire. So I tried to unlink the pieces and re-link them in the correct order. But both link and unlink are grayed out. When I select the pieces, all of them highlight. If I select edit linked parts, I can edit them individually, but I can't unlink them in order to put them in the correct order. Is this a bug or am I doing something wrong?

I am not sure, but maybe don't wear/attach the HUD while editing, but drop it on a floor somewhere and edit it there.

Are you trying to edit the HUD while you are wearing it? I don't think you'll be able to unlink anything unless you detach it and THEN do your editing. Same with any attachment. When you're wearing an object, it is a single entity attached to a specific point on your av. If you could unlink its parts, you'd have more than one object vying for that attachment point. .... a no-no.

EDIT: Hah! You beat me to the Send button, Paulo.

Yep that was it! Thank you my friends!