Java has further enhanced security to make the user system less vulnerable to external exploits. Starting with Java 7 Update 51.
Java does not allow users to run applications that are not signed (unsigned), self-signed (not signed by trusted authority) or that are missing permission attributes.
Check out the below article to know more and to troubleshoot this issue;
I updated java, when I did so it wiped out the sites I played games on.
I went to their security settings and entered the following:
http://ww5.freearcade.com----I took this from their address.
Still does not let the game to load. I believe Bob told me how to do this, and it has worked in the past.
So Bob, if you see this, appreciate your help