Thank you for your post.
Since your server is running Mac OS X 10.11.4, you must update FileMaker Server to version 14.0.4b. See Knowledge Base Article #15844 for the specific installation information:
For information specific to FileMaker Server 14.0.4b update, see Knowledge Base Article #15575:
Thanks for your post - managed to fix two servers in two minutes and run all the scripts that stopped running after a certificate update.
This also killed the message about "No scripts are available for the specified account" that I was trying to find an answer to.
Both servers running Mavericks and FMS 10.4 FYI - still have one to do but am now forearmed