Jim Washington wrote at 2005-7-23 16:09 -0400:
He is attempting to copy an installation from one machine to another, and upgrade Zope to 2.6.4.
Exporting the product and instances works fine, but some object instances will not import correctly.
Usually, it is much safer to just copy the storage file(s). Export/Import is known to fail with ZClasses that inherit from other ZClasses defined in a different product (which probably is not your case).
A product instance is a folderish object that contains other objects. One particular folderish subobject will not import correctly; all the others import fine. The .zexp of the entire product instance, with subitems, etc., imports OK, but the one folderish object shows up as "broken" in the ZMI.
This usually means that its class could not be imported. Have a look at Zope's "ClassFactory" and check why it is unable to import/load the ZClass. -- Dieter