I have found the final resolution, which was ridiculously simple:   Go to the Java control panel, click Settings, and uncheck "Keep temporary files on my computer".  After making this change, the problem was resolved.  Thanks for everyone's help!
Hello, Suddenly, when i try to access EMC Navisphere 6, I get the error message "Error: Click for details".  When I click for details, I get an Application Error dialog box with this error: "SecurityException  com.sun.deploy.net.JARSigningExecution: Found unsigned entry in resource: [URL]" ('IP' is the actual IP for the Clariion).  Has anyone encountered this error and/or have any ideas?  I am on Windows 7 Pro 64-bit, Java 7 Update 45 and Java 7 Update 25 (64-bit) installed, and using IE9 (I have tried Google Chrome also and got similar results).
Cannot Access EMC Navisphere 6 Anymore