[Zope] No stack trace returned on XMLRPC call

[Jay, Dylan]

I'm calling a PythonScript via xmlrpc and an error is being returned that
includes HTML with the error type and value but no stack trace. I've no idea
if this is correct behaviour or a bug or a misconfiguration but it's really
annoying me as I have no idea how to reproduce the error inside zope where I
do get stack traces. The zope instance is running on w2k with -D option and
I get stack traces in the HTML with normal webrequests (assuming they cause
an exception). 

Is this a bug or what?