OSX Blocking JNLP Launch Java1.8U40 - Anyone Know Why?

We deploy our application as a JNLP launch file and/or as a webpage applet.

I have a customer that updated his MAC OSX system to the latest Java Version 1.8_40. After upgrading the JNLP launch stopped working. It seems to start Java (flashes blue java logo) then stops. No Exception is thrown. I suspect yet another OSX security hurdle.

• We adjusted his OSX Security settings to trust our application.


• We adjusted his Java security to trust our site.


• We also adjusted the Safari preferences to allow the application to run unrestricted ("unsafe mode").


• The application is signed with a code signing certificate.


• The customer can use the Applet launch method using the safari Java plugin.


• All other customers (OSX & Windows) are generally fine. If this is a new MAC Java issue I'd like to get ahead of it.

Anyone else out there see this? Any clues about what is causing the issue?