Starting a Web game doesn't work or opens a blank page
Most of the time this is the symptom of the Java applet plug-in being disabled in your Web browser or in your system.
On Mac OS X:
Since the latest Java update on Mac OS X, Apple disabled "Java Applets" in Safari, preventing our Web games to launch.
It is also possible that Java applets are disabled globally. Please check in "/Applications/Utilities/Java Preferences" the status of the "Enable Java Applets" check box.
Since security update "Java for OS X 2012-006" on Mac OS X "Lion" and "Mountain Lion", Apple Java plug-in has been uninstalled. To use our Web games, click on the region labeled "Missing plug-in" to download the latest version of the Java applet plug-in from Oracle.