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there's a change with Security setup with FM 16. "fmurlscript - Allow URLs to perform FileMaker scripts" is NOT activated per default!
In the Menu 'File', select 'Manage' / 'Security' *)
click the Tab [Extended Privileges]
click "fmurlscript - Allow URLs to perform FileMaker scripts", edit, and activate 'fmurlscripts' for every Privilege Set AND Active Account.
*) need to LogIn again to Manage Security even with [Full Access] Privileges is another change with FM16.