Im clan leader but when i go in game, and then to barracks - the clan details and clan invites sections are locked.
Bizzare. As a result not earning any xp for my clan. Other members of the clan are not experiencing this bug.
Never had these problems wit the clan set up in mw3 or black ops.
Have you tried logging-out of your account in your console? Try that please. Then reboot your console and your internet connection as well. Then afterwards, relog-in to your game account. Deleting your game account from your console will also help.This should resolve the Clan Details issue (but you Clan Details is not as usefull as the Call of Duty app, download that instead).
By the way, you should not be able to access the invites section since you are the Clan Leader. Clan Leader cannot view invitations to join other Clans.