[Zope] Zope-2.6.1/Redhat9.0

Dear All, Has anyone heard of problems running Zope 2.6.1 on Redhat Linux 9.0 using ZServer/Python 2.1.3? Specifically, unstable web browsing unless running in single thread mode, particularly when accessing the management interface, and crashing when ZServer FTP is accessed (ie. through port 8021)? We have this problem, from an installation from the binary tarbell onto a clean installation of RH9.0 running on x86. If this is a common problem - is there a solution? Cheers, Andrew