[Zope] Cannot save Version

[Jentsch, Peter]

Hello! I created and logged in to a version object on my Zope-Site to do
some extensive remodelling. When I tried to commit the changes, Zope
responded with the following error:

Error Type: KeyError
Error Value: %} 
[...]
Traceback (innermost last):
  File /opt/Zope-2.0.1-2/lib/python/ZPublisher/Publish.py, line 214, in
publish_module
  File /opt/Zope-2.0.1-2/lib/python/ZPublisher/Publish.py, line 179, in
publish
  File /opt/Zope-2.0.1-2/lib/python/Zope/__init__.py, line 201, in
zpublisher_exception_hook
    (Object: Fake)
  File /opt/Zope-2.0.1-2/lib/python/ZPublisher/Publish.py, line 169, in
publish
  File /opt/Zope-2.0.1-2/lib/python/ZODB/Transaction.py, line 237, in commit
  File /opt/Zope-2.0.1-2/lib/python/ZODB/DB.py, line 557, in commit
  File /opt/Zope-2.0.1-2/lib/python/ZODB/FileStorage.py, line 368, in
commitVersion
    (Object: /dmz-inter03/opt/Zope-2.0.1-2/var/Data.fs)
KeyError: (see above)

where %} was preceded by 6 nullbytes.

I'm still able to access the version, so I could reconstruct the changes
after discarding the version, but actually I'd rather find a way to *save*
the changes.

Thanks
Peter