Hi, I tried to move to Python 2.1.2 with an existing site and got a stack error under some circumstances. The site provides five different websites distinguished by Virtual Site Root. The error: python: Python/ceval.c:687: eval_code2: Assertion `(stack_pointer - f->f_valuestack) <= f->f_stacksize' failed. I found some places where this is mentioned, mostly explained with illegal bytecode. Because I removed all bytecode and shared libraries before recompiling Zope and the C extensions I dont't assume that this is the case. The interesting part is: the site which was defined first (using VSR) is accessible. Every other site fails. Also the navigation frame in the management interface fails while the content frame works without problems. The Python interpreter is the (first and) only one on the system so interferences with other Python installations are not possible. The configure line for Python: ./configure --prefix=/usr/local --with-crypt --without-pymalloc --with-threads Additionally I enabled SSL for the socket module. I hope someone can reproduce this. I am not able to do debugging for this myself. I will switch back to Python 2.1.1. Regards, Frank