Is it possible to find out which plugin or other app is causing the blocking that can be seen from the screenshot ?
(Java complains about an expired certificate)
Our usual plugins all have valid certificates.
When I open the complete tree in the "Code Signing Utility" from Patrick Talbot, all jars either have a "locked" symbol or a green symbol with a small s, meaning "signed with current certificate".
There is no jar in the complete tree that shows the symbol for "Signatur is expired or invalid"
It does not help to add our JNLP to the Java exception list for the specific user. In other cases, that helped.