At least one user has reported to get "java.lang.SecurityException: denied access outside a permitted URL subpath" when starting the SoundHelix applet. This happens when the XML file (or files included by that file) are retrieved. The root cause of the exception is currently unknown, because it works for most people. It might be a bug or configuration problem in the Java plugin or a problem in the browser. If you do get this exception, please report your OS version, your browser version and your Java version along with the SoundHelix log output (including the exception stacktrace).