[ZODB-Dev] Strange output from fsresf.py

[Zanotti Michele]

Hi all,
Excuse me if I'm not a zodb developer and post here this question, but I need a little help and I can't find a Zodb users list. 
Well, I have upgraded my production site from Zope 2.8.5/Plone 2.1.4 to zope 2.9.7/Plone 2.5.3 (on win2003).
Everything seems work (yes, only a random control!) . I have run fstest.py with no problems. But then fsref.py gives me tons (a 18mb txt!) of message as:

oid 0x2L OFS.Application.Application
last updated: 2007-07-21 11:59:27.011000, tid=0x36F230F733F3700L refers
to invalid objects:
        oid ('\x00\x00\x00\x00\x00\x01\x08&', None) missing: '<unknown>'
        oid ('\x00\x00\x00\x00\x00\x00\x8f\xb3', None) missing:
'<unknown>'
        oid ('\x00\x00\x00\x00\x00\x00\x8f\xb5', None) missing:
'<unknown>'
        oid ('\x00\x00\x00\x00\x00\x01\x0f\xfd', None) missing:
'<unknown>'
        oid ('\x00\x00\x00\x00\x00\x02\xfa\x0b', None) missing:
'<unknown>'
        oid ('\x00\x00\x00\x00\x00\x04b\x90', None) missing: '<unknown>'
..... oid 0x8BFE9L OFS.Image.Pdata last updated: 2007-03-12
11:27:18.742000, tid=0x36C36CF4FF74311L refers to invalid object:
        oid ('\x00\x00\x00\x00\x00\x08\xbf\xe8', None) missing:
'<unknown>'
.....
oid 0xA2916L Products.ResourceRegistries.tools.CSSRegistry.Stylesheet
last updated: 2007-07-21 09:34:22.994000, tid=0x36F227E621B9466L
refers to invalid object:
        oid ('\x00\x00\x00\x00\x00\n)\x1b', None) missing: '<unknown>'

oid 0xA2917L Products.ResourceRegistries.tools.CSSRegistry.Stylesheet
last updated: 2007-07-21 09:34:22.994000, tid=0x36F227E621B9466L
refers to invalid object:
        oid ('\x00\x00\x00\x00\x00\n)\x1a', None) missing: '<unknown>'

oid 0xA2918L Products.ResourceRegistries.tools.CSSRegistry.Stylesheet
last updated: 2007-07-21 09:34:22.994000, tid=0x36F227E621B9466L
refers to invalid object:
        oid ('\x00\x00\x00\x00\x00\n)\x19', None) missing: '<unknown>'
....

No problems with the old data.fs (pre-migration) and Zope fsrefs.py 2.8.5. version. I also have started a Zope 2.9.7 with Plone 2.1.4 and again fsrefs.py (2.9.7 version) gives these messages.
Can anyone explain me if my zodb has problems and, if so, their gravity (and point me to the solution)? Also, how can I find from the oid the object with problems? I have found http://mail.zope.org/pipermail/zodb-dev/2006-July/010321.html but I think it is for a older version of zodb.

Thanks a lot
Michele
p.s. 
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