Hello, I compiled Python 2.4.4 on AIX 5.3, with cc_r compiler, installed Zope-2.9.8and Plone-2.5.1. Everything seems work well, excepted when I call Plone on the browser or click on the "view tab" inside one Plone site at the ZMI. When I do this, I get a "Segmentation fault" on the server. Can anyone help me with this issue? Are there many AIX and Zope box running Plone? I found this text in at Zope-2.9/doc/PLATFORMS/AIX.txt : "from Wolfgang Roesner (reporting segfaults and a fix) The default stack size for a pthread on AIX (at least in my configuration) is 96kB. On Solaris it's 1M. As soon as I explicitly set the initial stack size to 1M the problem went away and it appears as if Zope is up and running. Unfortunately I really had to change "thread_pthread.h" in Python which obviously is not a nice thing to do as I now have a need for my own private version of Python. But at least I have a running version of Zope on AIX." Is this really something to try? Thank you, Marcello Bax