Just installed FMS 16 on my Mac which seems to work OK.
But when I make changes to the Database Server settings these cannot be saved.
Deleted the FileMaker server completely from my Mac and reinstalled. But problem remains.
Previous installation was FMS15, which did not have this problem.
I’m running OS X 10.11.6.
I deinstalled the server, dumped all files I could find and ran first aid on my disk.
After all this work I reinstalled the server and finally I was able do what I was trying to do.
I could save the changes to the database server.
Would have been nice if the server would give better error response and not just a message there are unsaved changes.