I've made new releases of ZODB: http://pypi.python.org/pypi/ZODB3/3.9.1 http://pypi.python.org/pypi/ZODB3/3.8.4 These releases fix a serious bug when ZEO servers are configured to support Blobs. If there was a conflict error on a blob, the storage server stopped committing any new transactions. Jim -- Jim Fulton