javax.swing.text.html.ImageView is incorrectly accessing System properties without checking for proper previledges or traping an AccessControlException.
This problem is related to bug #4181905 but a slightly different variant. The offending lines are below.
424---> s = System.getProperty("awt.image.incrementaldraw");
sIsInc = (s == null || s.equals("true"));
427---> s = System.getProperty("awt.image.redrawrate");
sIncRate = (s != null) ? Integer.parseInt(s) : 100;
Line 424 generates AccessControlException in the Java Plugin running JDK1.2FCS-N within IE4. I suspect 427 would do the same if it ever got there.
When you get to testing the bug fix we have JavaHelp test we can run or provide.