It appears that a side-effect of the applet startup and shutdown work for 6u4 (6399750) is that on the Mozilla Firefox family of browsers the applet's area is being initially cleared to black before being initially painted. This causes distracting flickering when reloading applets. This behavior should be understood and fixed if possible. It does not occur in the Internet Explorer version of the Java Plug-In, which may indicate that native code setting window properties or similar may be applied to fix the problem.