JRE version problems on OS X

Hi Everyone,
With the release of 1.4.1 on OSX, I've been trying to test our product. I didn't have problems with one of the prior developer previews, but after installing the final, I can't get IE or Netscape to recognize 1.4.1 is installed. (Our product requires 1.3.1_03 as the minimum and the browser keeps trying to have us install this rather than use the 1.4.1 that's installed.)
I tried the latest Safari browser which DID properly launch 1.4.1, but errored out at some point during the load. Since I've gotten this working fine in the past with the developer previews, I'm certain it will launch fine under netscape - if only I can get it to recognize 1.4.1 and use it.
Any suggestions? Our class id is correct and not forcing 1.3.1_03, but I am at a loss as what to try next as Mac's are not my forte.

Yeah, I gave up on IE on the mac long ago - what a piece of crap.
What's weird is while I was testing the developer preview versions of 1.4.1, it worked great under netscape. I just can't understand why the official release doesn't.
Thanks for your help. And Netscape, if you're reading this - get on the ball!

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For drivers download use Toshiba download page - http://www.toshiba.eu/innovation/download_drivers_bios.jsp
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This is the version of Java I used to compile my applet. I have used Sax parser in my applet.
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java version "1.4.1_02"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.1_02-b06)
Java HotSpot(TM) Client VM (build 1.4.1_02-b06, mixed mode)
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I would try upgrading the plug-in.
And of course, I could be wrong. You might not have Javasoft afterall.

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Java Plug-in 1.6.0_26
Using JRE version 1.6.0_26-b03-384-10M3425 Java HotSpot(TM) 64-Bit Server VM
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java.lang.ClassNotFoundException: ZeroApplet.class
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    at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
    at sun.applet.AppletClassLoader.loadClass(AppletClassLoader.java:144)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
    at sun.applet.AppletClassLoader.loadCode(AppletClassLoader.java:662)
    at sun.applet.AppletPanel.createApplet(AppletPanel.java:807)
    at sun.plugin.AppletViewer.createApplet(AppletViewer.java:2389)
    at sun.applet.AppletPanel.runLoader(AppletPanel.java:714)
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[email protected]

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<h3>
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