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Java, Tomcat and Netscape 4.7x

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Hi all,
If this is posted in the wrong forum, I apologize in advance
I have a strange problem that I am hoping someone has run into (and fixed!) before. I have deployed an applet written in 1.1.8, coupled with a servlet written in 1.3 (on NT) which is contained in Jakarta Tomcat. The webserver is Apache.
The applet works fine in IE 4 - 5.5. It also works in Netscape 6, but it only works on some Netscape 4.7x browsers. On others it doesn't even get to the applets init() method, and fails with a "can't init NEW" message. The error messages in the console window are:

java.lang.NullPointer.Exceptionat java.lang.StringBuffer.append(Compiled Code)at netscape.applet.DerivedAppletFrame$LoadAppletEvent.dispatch(Compiled Code)at java.awt.EventDispatchThread$EventPump.dispatchEvents(Compiled Code)at (Compiled Code)at netscape.applet.DerivedAppletFrame$ Code)
I have looked through all the browser settings on the various machines I tried it on, and everything seems the same. I can't see any difference that would result in this error between those that can run it and those that can't. For instance, some development machines can run it, some get the error - while some sales machines can run it, while others can't.
Any ideas would be greatly appreciated!

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