Hi, I'm porting an application from Zope 2.0 to Zope 2.4.1 and am experiencing strange crashes. We use a session manager written in C with a Python interface. When calling the get() method of the session object in DTML (be it in a var-, call- or if- tag), Zope crashes, but when passing the session object down to an External Method and calling get() from there, it works! I put a printf() in the first line of the get() function and realized that Zope crashes before calling the function. The crashing DTML Method looks like this: <!--#var standard_html_header --> <dtml-call "test2(REQUEST.session2)"> <dtml-call "test3(REQUEST)"> <dtml-let s="REQUEST.session2"> <dtml-call "test2(s)"> <dtml-var "s.get('pop_show')"><br> </dtml-let> The standard_html_header prepares the session object and puts it in REQUEST.session2 test2 is an External Method looking like this: def test2(a): print "test:" + str(a) print "test2:" + str(a.get('pop_show')) and test3 looks like this: def test3(REQUEST): s = REQUEST.session2 print "test3:" + str(s.get('pop_show')) print "test3:" + str(REQUEST.session2.get('pop_show')) The DTML method crashes in <dtml-var "s.get('pop_show')">. test2() and test3() work as they should. Is there a way to find out where Zope crashes (I have a feeling it's somewhere in the C Codes)? Where shall I put strategic printf()s?? thanx, bs