EndNote X6 "EndNote is not responding. Error = -1712" Word Mac

Hi,

I have a new Mac Book 13" with OS 10.8.4. Endnote X6.0.2 seems to freeze occasionally, when I select particular references in the library and not on others. Closing the Appleeventsd process does not help. Any suggestions? I would assume that whatever problems existed with 10.8.2 should have been resolved by now…

Thanks