You may get the following error while running content export

Violation of PRIMARY KEY constraint 'PK__#ExportObjects____3B8E1355'.
Cannot insert duplicate key in object 'dbo.#ExportObjects'

Don't waste hours to resolve this like me.

This is fixed by KB950279.

MS claims this was included in Service Pack 1, but it isn't.

You have to contact Microsoft for hotfix KB950279, I have used it and
it has fixed the above issue