[GeneralDiscussion] Site Error/ An error was encountered while publishing this resource.

Hi John, that is quite odd. The first thing I see there that's  
probably indicating a problem is::
     * Module zope.pagetemplate.pagetemplate, line 117, in pt_render
       Warning: Macro expansion failed
       Warning: exceptions.AttributeError: pt_macros
If nothing has changed about your zope/zwiki configuration, is it  
possible you installed something elsewhere on the system - like a  
newer version of zope.pagetemplate - that could be affecting it,  
causing the standard pt_macros attribute to disappear ?

I would also look at the traceback in /error_log, where you'll get the  
clearest rendering. I'd like to know what exactly it shows after the  
final "AttributeError" at the bottom.

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