Since upgrading to 2014 the mates folder has developed a mind of its own, it started when i tried to mate a new component, coincident, it refused, i deleted every mate in the assembly and still it claimed it couldnt, the mates folder showed an error despite being empty, i tried the mate expert and it showed a mate error on a mate which had been deleted, i clicked diagnose and it said "the mates folder has no errors, rebuild" rebuild has no effect, its now happening permanently in all assemblies, it shows the mate folder as having an error and when you enquire its a mate which no longer exists, the problem persists afetr saving closing restarting and rebooting.

cheers