I have a site that is currently running 2.1.7. If I install a new instance of 2.1.6, reload all the products, and copy all the Data* file from the 2.1.7 instance to the 2.1.6 instance, everything appears to work fine. However, if I try to pack the database, the following error is generated. The database packs without any problem when using the 2.1.7 instance. This copy of Zope is being run on RedHat Linux6.1. Thanks in advance for any help provided. Traceback (innermost last): File /disk_01/OPT/zope/Zope-2.1.6-linux2-x86/lib/python/ZPublisher/Publish.py, line 214, in publish_module File /disk_01/OPT/zope/Zope-2.1.6-linux2-x86/lib/python/ZPublisher/Publish.py, line 179, in publish File /disk_01/OPT/zope/Zope-2.1.6-linux2-x86/lib/python/Zope/__init__.py, line 202, in zpublisher_exception_hook (Object: Fake) File /disk_01/OPT/zope/Zope-2.1.6-linux2-x86/lib/python/ZPublisher/Publish.py, line 165, in publish File /disk_01/OPT/zope/Zope-2.1.6-linux2-x86/lib/python/ZPublisher/mapply.py, line 160, in mapply (Object: manage_pack) File /disk_01/OPT/zope/Zope-2.1.6-linux2-x86/lib/python/ZPublisher/Publish.py, line 102, in call_object (Object: manage_pack) File /disk_01/OPT/zope/Zope-2.1.6-linux2-x86/lib/python/App/ApplicationManager.py , line 338, in manage_pack (Object: ElementWithAttributes) File /disk_01/OPT/zope/Zope-2.1.6-linux2-x86/lib/python/ZODB/DB.py, line 522, in pack File /disk_01/OPT/zope/Zope-2.1.6-linux2-x86/lib/python/ZODB/FileStorage.py, line 883, in pack (Object: /disk_01/OPT/zope/Zope-2.1.6-linux2-x86/var/Data.fs) IOError: (see above) -Mark