Hi, I've noticed something here, but it doesn't seem thread related since all zope hangs. from time to time (seems to be random), when using the management interface, zope completely hangs when using IE5 under NT4SP5. With IE4 on the same machine (before the update) or Netscape 4.72 under Linux (same machine in dual boot) there's no problem at all. It seems (not sure) the hang comes when an error occurs, and error often occur when you begin with zope... when it hangs I can't connect to zope from any workstation here, even trying to access a different page, outside the management interface. Tested with 2.1.4 and 2.1.6 under SparcLinux (RedHat 4.2, kernel 2.0.35, libc-5.3.12, python 1.5.2), and we don't suffer seem to suffer from memory leaks. hope this helps to solve the problems. Jerome ALET - alet@unice.fr - http://cortex.unice.fr/~jerome Faculte de Medecine de Nice - http://noe.unice.fr - Tel: 04 93 37 76 30 28 Avenue de Valombrose - 06107 NICE Cedex 2 - FRANCE