Jinitiator "Applet Started"

We have recently upgraded a 3rd party system we use (and have had no problems with previously) which runs on Forms and Jinitiator as shown below:
Previous Setup: Jinitiator 1.1.8.16 / Oracle Forms 6i / Oracle 9i
Upgraded Setup: Jinitiator 1.3.1.28 / Oracle Forms 10 / Oracle 10g
This new upgraded set up works successfully on around 50% of our machines, although the rest of our users receive only a white screen with an "Applet Started" message on the Internet Explorer status bar. The machines that fail to work all appear to be Windows 2000 machines with IE6, although other machines on Windows 2000 with IE6 work fine, so I don't think there is a compatability issue with any software.
The Jinitiator console log stops at the following message:
"RegisterWebUtil - Loading WebUtil Version 10.1.2.2"
I had thought that permissions could be a problem as some machines have limited access rights, but even when logging in as the machine's administrator account I still get the same white screen and status bar message.
Does anyone have any ideas as to what could be causing these problems?
thanks, Jonathan

Console log with trace level set to 5 is attached below, don't know if it'll be of any use!
thanks, Jonathan
Unregistered modality listener
Doing a join...
Sending events to applet. STOP
Removed trace listener: sun.plugin.ocx.ActiveXAppletViewer[oracle.forms.webutil.common.RegisterWebUtil,0,0,1x1,invalid,layout=java.awt.BorderLayout]
Sending events to applet. DESTROY
Sending events to applet. DISPOSE
Sending events to applet. QUIT
Done with join ...
Finding information...
Releasing classloader: sun.plugin.ClassLoaderInfo@13385d, refcount=0
Caching classloader: sun.plugin.ClassLoaderInfo@13385d
Current classloader cache size: 1
Done...
Registered modality listener
Referencing classloader: sun.plugin.ClassLoaderInfo@13385d, refcount=1
Added trace listener: sun.plugin.ocx.ActiveXAppletViewer[oracle.forms.webutil.common.RegisterWebUtil,0,0,1x1,invalid,layout=java.awt.BorderLayout]
Sending events to applet. LOAD
Sending events to applet. INIT
Sending events to applet. START
RegisterWebUtil - Loading WebUtil Version 10.1.2.2
-----------------------------------------------------------------

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M.Taher wrote:
thank you for your time but my issue is
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