This is an ongoing issue. Happens when I am copying and pasting. In Design buttons are greyed out. (See attached). I've had my computer taken over by Adobe twice and it is only a temporary fix. We also uninstalled all of CC and reinstalled and I am still having the same issues. Please help. Working on an I Mac with Sierra version 10.12.5 and latest CC updates.
Please try these steps and share results
Check how application works there, If it works fine
Go to Location ~/Library/Preferences
Follow same steps for
Note: If you are on office system ,these (/Library/Application support and/Library/Preferences) folders may or may not allow you to add user , that is completely fine.