I remember that 2.6 had issues with packing, but I was under the impression that they'd been fixed... However, attempting to pack a Data.fs in 2.6-current-cvs fails for me: File "/export/01/zope/dev_csr_code/lib/python/ZODB/DB.py", line 526, in pack try: self._storage.pack(t,referencesf) File "/export/01/zope/dev_csr_code/lib/python/ZODB/FileStorage.py", line 1503, in pack opos = p.pack() File "/export/01/zope/dev_csr_code/lib/python/ZODB/fspack.py", line 680, in pack self.gc.findReachable() File "/export/01/zope/dev_csr_code/lib/python/ZODB/fspack.py", line 464, in findReachable self.buildPackIndex() File "/export/01/zope/dev_csr_code/lib/python/ZODB/fspack.py", line 486, in buildPackIndex self.checkData(th, tpos, dh, pos) File "/export/01/zope/dev_csr_code/lib/python/ZODB/fspack.py", line 189, in checkData ": %d != %d", dh.tloc, tpos) File "/export/01/zope/dev_csr_code/lib/python/ZODB/fspack.py", line 170, in fail raise CorruptedError(s) ZODB.fspack.CorruptedError: /app/zope/dev_csr_server/var/Data.fs.packtest:9200838:data record does not point to transaction header: 17391715 != 9200760 This is reproducible. The particular Zope that uses this file was shut down cleanly before attempting to pack the DB. The code that fails to pack is: import ZODB from ZODB import FileStorage filename='/app/zope/dev_csr_server/var/Data.fs.packtest' store = FileStorage.FileStorage(filename) db = ZODB.DB(store) db.pack() # boom. Help? I'm using the ZODB that's in the current 2.6 branch of CVS - according to ZODB/__init__.py it's version 3.1.2. Is a newer version of ZODB going to help here? Anthony