Try going to System Settings and then the Java control panel. Locate the Java applet runtime configuration and make sure it's pointing to Java 8 and not some ra

Try going to System Settings and then the Java control panel. Locate the Java applet runtime configuration and make sure it's pointing to Java 8 and not some random Java 7 applet runtime the upgrade left behind. Java has system wide preferences for runtimes of both the full JRE and the plugin, separately. Failing that, go to java.com and see what their check says.