I have the same problem, but I eventually "corrected" it, by forcibly closing the connection each time prior to running the queries.  Fortunately, my scenario uses page caching to reduce the number of hits to the db so the additional effort of reopening the connection is neglible.

I'd sure like to know what the problem is, though...

RHEL
Zope 2.7.3
Python 2.3.4
psycopg 1.1.18
PostgreSQL 7.3


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