Applet problem with IE5

I have a client who upgrade his browser to IE 5 and the latest java vm but he still receives this error:

com.ms.lang.VerifyErrorEx: com/island/chicago/inlet/Inlet.jbInit: type
mismatch: actual type jclass/bwt/JCTabButton, expected type
jclass/base/BaseComponent
      at com/island/chicago/inlet/Inlet.init
      at com/ms/applet/AppletPanel.securedCall0
      at com/ms/applet/AppletPanel.securedCall
      at com/ms/applet/AppletPanel.processSentEvent
      at com/ms/applet/AppletPanel.processSentEvent
      at com/ms/applet/AppletPanel.run
      at java/lang/Thread.run

Several other people running the same version browser and java vm do not have a problem.  He's running windows NT.  

Is there something I should look at in NT as the cause of this problem?  Has anyone encountered this problem before?

Thanks,
Rich
richpAsked:
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heyhey_Commented:
I suppose that all the other people have installed JBuilder ...
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richpAuthor Commented:
This was on the client side using only a browser.  

I thought if a client has the same browser version and virtual machine the applet should run and it does for the majority of the clients.
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heyhey_Commented:
both IE and NN on Windows will load classes from the system classpath automaticly. so if your applet uses some borland classes some browsers may load them from the local classpath.

just a guess :)
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richpAuthor Commented:
Wouldn't those classes be loaded from the jar file?  If not, are you saying that user may have a local copy of a non-compatible borland class?
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heyhey_Commented:
'If not, are you saying that user may have a local copy of a non-compatible borland class?'

yes - this is possible.
I can't work directly with your enviroment, so I'm just guessing ...
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richpAuthor Commented:
It was a borland class but a klgroup class. The user had another jar file in his classpath which contained non-compatible jclass class files.  
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