After JRE 8.0.45 Update you may have a problem with the unsigned WEBSDR Java applet for the sound and waterfall.

You will need to add a couple of lines to the Java policy to allow the connection to WEBSDR's
Locate the java.policy file in the java install folder and edit it with notepad or similar text editor.
On my 64bit PC it's (C:\Program Files (x86)\Java\jre1.8.0_45\lib\security)
On a 32 bit windows PC it should be (C:\Program Files\Java\jre1.8.0_45\lib\security)

Add the following lines (The ones in Red) to the existing file

grant {
        // Allows any thread to stop itself using the java.lang.Thread.stop()
        // method that takes no argument.
        // Note that this permission is granted by default only to remain
        // backwards compatible.
        // It is strongly recommended that you either remove this permission
        // from this policy file or further restrict it to code sources
        // that you specify, because Thread.stop() is potentially unsafe.
        // See the API specification of java.lang.Thread.stop() for more
        // information.
        permission java.lang.RuntimePermission "stopThread";

        // allows anyone to listen on dynamic ports
        permission "localhost:0", "listen";
       // allow MowCopSDR, and others
permission "WhateverWebsite:WhateverPort", "connect,resolve";
permission "", "connect,resolve";

        // "standard" properies that can be read by anyone

        permission java.util.PropertyPermission "java.version", "read";

Save the file and try again