One of our PCOEM customers reported demo programs did not run on IE 6 after upgrading from 7u3 to 7u4 or later.

OS : Windows XP 32bits
IE : 6
JRE : 7u4 or later
Demo: http://www.javakode.com/applets/01-drawingLines/ or applets\Animator\example1.html from jdk

The error message is shown below on IE.

---
Your browser understands the APPLET tag but isn't running the applet, for some reason."
        Your browser is completely ignoring the APPLET tag
---

The applet can run on IE 7 so it only occurs on IE 6.