I have tried to run Zope 2.1.2 on Digital Unix. OSF1 V4.0F Using the default start script I get to the the first page but then the ZServer gives a fatal stack overflow error message, as soon as I click on one of the links. Is this a threads problem? I tried compiling my own python with-dec-threads option enabled but had the same result. Any help apreaciated ? Here is some information, that might be of help. This is a slow alpha machine with 24M of RAM. The proces takes a good while to start up. Eating up RAM until it reaches 14Mb. I get the first page, but as soon as I request a diferent page (by clicking on /QuickStart/ or /manage links) I get: Stack overflow: pid 11182, proc python, addr 0x14085ffe8, pc 0x12003c318 the process then dies and a new one slowly loads... Reloading the root page or /index_html seems not to cause the Stack Overflow error. Thanks in advance, damian