Applets fails to display properly under some scenarios. Try to load following applet inside IE browser. Applet with JButton should get displayed, but it's not. Now try to resize the brower. Applet will get displayed properly. Reload the browser applet will disappear again.

http://sqeweb.sfbay.sun.com/deployment2/jitu/deployment_JDK7_int_ws/deployment/src/plugin/manual/html/JEditorPaneTest.html