I've got a project (on a machine at another location) that I cannot export due to all of the share options being greyed out. This has never happened before. I've tried various suggestions I have found through Google. Copying to a new event, new project, exporting/importing XML, etc. ...to no avail.
But I think it has something to do with not importing a camera archive fully the first time. I have that camera archive here at my home studio, and I cannot reimport or relink, but I can import again which reconnects everything that is missing due to the faulty import. It appears that even though FCPX thinks everything is connected and consolidated, some of the files from the camera archive are still located in the camera archive only. And when I delete those camera archive specific files I can share normally. So there is some kind of weirdness going on there.