I see Chris post at: http://mail.zope.org/pipermail/zope-dev/2003-March/019116.html As far I see, this bug still existing in Zope 2.6.4, Zope 2.7.0. Its strange because into Changes histore of Zope it seems to be fixed into 2.6.2: Zope 2.6.2 beta 2 Bugs Fixed * TemporaryStorage (which is used by TemporaryFolder, and thus the default sessioning configuration) no longer uses a "LowConflictConnection" database connection. This fixes a bug in which data structures used for session housekeeping data could become desynchronized; the symptom for this was KeyErrors being raised from TransientObjectContainer's get method. As a result, many more conflicts will be raised under high session load, but desynchronization will not occur. Could you please at least point me where I can dig to get it fixed? I will try to read Python code in Transience.Transience but I am not sure in my qualification in this area. Bug reported at zope.org as: http://zope.org/Collectors/Zope/848 but until now there were no comments which help me to fix this. may be something needs to be changed into my code? in the beginning of many scripts I have the following: request=container.REQUEST session=request.SESSION please give me a hint. Thanks. -- Alex V. Koval http://www.halogen-dg.com/ http://www.zwarehouse.org/