[Zope] Nested error messages

I stubled into same problem as described in message: http://groups.yahoo.com/group/zope/message/71986 WHat creates the thing interesting is, that I have a couple of virtual hosts running in same box. ( Zope 2.4.2 ) And this nested error message comes only up with one virtual host. This one virtual host differs from other in two ways: it requires user to authenticate themselves and is protected with ssl-connection. I first thought that there migth be error in standard_error_message and copied it from a working directory. No success. Any ideas? -huima