(BTW I forget in my previous post to precise I use 2.4.0 on FreeBSD). Here is a DTML Method : <dtml-in RESULTS> <dtml-let RESULT=sequence-item> <tr><dtml-var "CONVERTER('','')"> <dtml-in FIELDS> <td><dtml-var "CONVERTER('', '')"></td> </dtml-in> </tr> </dtml-let> </dtml-in> This method is called from a Python Script, and CONVERTER is a reference to another Python Script. The first <dtml-var "CONVERTER('','')"> works perfectly (the script is called and returns correctly), but the SECOND ONE makes Zope core dump. Urglhh... Can someone explain me this more than strange (and more than annoying) behaviour ? Thanks, Regards, P.-J. -- If the only tool you have is a hammer, you tend to see every problem as a nail. Si le seul outil dont vous disposez est un marteau, vous avez tendance à voir chaque problème comme un clou. --Abraham Maslow