I have a user on Windows XP SP3 running Java 6 Standard Edition Update 20 (build 1.6.0_20-b02).
The issue is that when Java applets load the Java splash screen is very shaky (I will have to take a screenshot if you don't know what I am talking about) and than the Java applet screen does not show properly. The Applet we use most is for a security camera and you can't view the camera properly because of the Java issues.
I have uninstalled Java and re-installed and still having the same issue.
I do not see any errors on the Java Console, and this only happens on his computer I am running the same version of Java and the browsers and do not have the same issue on my machine.