Hi, In past times I was advised to apply a patch and increase stack size for pthreads of FreeBSD. I did and it helped for Zope 2.5.0 & CMF 1.2 + PageTemplates. It was moderately stable situation but it appears to crash again. For other site (with other Zope version)... Zope Version (Zope 2.4.3 (source release, python 2.1, linux2), python 2.1.3, freebsd4) Python Version 2.1.3 (#4, May 15 2002, 17:31:48) [GCC 2.95.3 20010315 (release) [FreeBSD]] System Platform freebsd4 If portions (PT) of a web-page are rendered everything is ok. Management screens either has no problems. But rendering a compound PT-based page makes Zope crash with assertion "STACK_LEVEL() <= f->f_stacksize" failed: file "Python/ceval.c", line 695 on console. What is suggested solution? Increase pthreads stacksize? it was THREAD_STACK_SIZE=0x20000 as advised... Thanks, m. -- Myroslav Opyr zope.net.ua <http://zope.net.ua/> ° Ukrainian Zope Hosting e-mail: myroslav@zope.net.ua <mailto:myroslav@zope.net.ua> cell: +380 50.3174578