[Zope] Can't Undo any transactions in Zope 2.7!

[Sleeter]

I can't undo ANY transactions in 2.7 (python 2.3.3).

Anyone else having the same problems or know solutions?

Here is traceback:

Traceback (innermost last):
  Module ZPublisher.Publish, line 104, in publish
  Module Zope.App.startup, line 221, in commit
  Module ZODB.Transaction, line 233, in commit
  Module ZODB.Transaction, line 348, in _commit_objects
  Module ZODB.DB, line 653, in commit
  Module ZODB.FileStorage, line 1303, in transactionalUndo
  Module ZODB.FileStorage, line 1312, in _txn_undo
  Module ZODB.FileStorage, line 1405, in _txn_undo_write
MultipleUndoErrors: Undo error 0000000000000b5c: Undo error
0000000000000b5c: _loadBack() failed


Thanks for any help.

Chris