Hey!
From one minute to the other the bug appeared on my system as well… was using EndNote 7.5.1.1. and Word 2016 15.20. on OSX 10.10.5.
Luckily I was able to download Word 2011 via office 365. With the older version of Word I got it back running.
When will the update be availbale to fix the bug?
Best regards!