Situation: Filemaker 16 – “File Options” “Log in using” problems:
In Filemaker 15 (and previous versions) it appears that the Extended Privilege "Access via Filemaker Network (fmapp)” could be unchecked for a Custom Privilege set and still open the file with a login that had that Privilege set.
In Filemaker 16, this is no longer the case. To fix this – you have to go to the Custom Privilege Set and turn ON the following option:
Fmapp - Access via FileMaker Network, server-side scripting, or FileMaker Go