Can't invite people from Mac Calendar, but ok from iPhone and iPad

Solved! (hopefully).

I went to iCloud settings on my MBA and unchecked the links to both Contacts and also Calendar. Restarted MBA and obviously there are now no Contacts in my address book, nor appointments in my Calendar. However, when I set up a new event "add invitees" now shows. Rechecked the link between Contacts and iCloud, and "add invitees" still shows up in Calendar. Rechecked the link between Calendar and iCloud, and "add invitees" is still there (hooray!). I think I'd previously unchecked both Calendar and Contacts individually at some stage, but I think (can't be sure of this), that the trick seemed to be unchecking them both, then restarting.

Hope this might be of help to anyone else who suffers this annoying problem.

Yes, all events are synced via iCloud across iPhone/iPad/MacBook Air/iMac. I can invite people on all devices apart from the MacBook Air. Events created on phone/iPad/iMac all sync ok across the cloud and show up on MacBook Air, including invitees. On MBA though the "Add invitees" option just isn't there.

Hi Brian, thanks for responding.

I (turned off the Filevault on my MBA then) logged out of my MBA as the user, and logged in as a guest. Went to the Calendar and "yes", the option to add invitees was there. Went back to my user account and it disappeared again.

There must be a setting wrong in my user account somewhere.......... but what and where?

Thanks for the suggestion Eric-F. Tried as you suggested but still no "add invitees" when I delete all the login items and restart.