mjm THANKYOU THANKYOU. My thesis is due in 10 days and I opened my docs this morning to see that EndNote in-texts were all corrupted. Gremlins is right. This “show field codes” unchecking fixed it 
Updated note to users: This also works in word for windows 10 (Office 365).
File
Options (Bottom option)
Advanced
Show document content (Uncheck show field codes instead of their values)