[Setup] unreleased or undetectable version of Zope — can't view ZMI — AttributeError: 'module' object has no attribute 'VersionBase'

[Graham Perrin]

Following changes to my buildout .cfg file, and buildout commands, I can't
view ZMI. 

At /plone_control_panel for one of the sites I see:

* Plone 3.3.4
* CMF 2.1.2
* Zope (unreleased version, python 2.4.5, darwin)
* Python 2.4.5 (#1, Feb 15 2009, 12:20:54) [GCC 4.0.1 (Apple Inc. build
5488)]
* PIL 1.1.6

Running client2 (of the ZEO cluster) in foreground, I see: 

2010-01-21 13:40:12 INFO Plone Dependency  
Unable to detect Zope version. Please make sure you have Zope 2.10.4 or
newer installed.

http://omnium.freeman-centre.ac.uk:5556/manage_main
Traceback (innermost last):
  Module ZPublisher.Publish, line 119, in publish
  Module ZPublisher.mapply, line 88, in mapply
  Module Products.PDBDebugMode.runcall, line 70, in pdb_runcall
  Module ZPublisher.Publish, line 42, in call_object
  Module Shared.DC.Scripts.Bindings, line 313, in __call__
  Module Shared.DC.Scripts.Bindings, line 350, in _bindAndExec
  Module App.special_dtml, line 178, in _exec
  Module Shared.DC.Scripts.Bindings, line 327, in __render_with_namespace__
  Module Shared.DC.Scripts.Bindings, line 350, in _bindAndExec
  Module App.special_dtml, line 178, in _exec
  Module DocumentTemplate.DT_With, line 76, in render
  Module App.PersistentExtra, line 57, in locked_in_version
AttributeError: 'module' object has no attribute 'VersionBase'
> /Applications/Plone/Zope-2.10.11-final-py2.4/lib/python/App/PersistentExtra.py(57)locked_in_version()
-> return (oid
(Pdb) a
self = <Application at >
(Pdb) c

How might I have ended up with an unreleased, or undetectable version of
Zope? 

Is something horribly wrong with the [zope2] section of my .cfg?

[zope2]
recipe = plone.recipe.zope2install
url = ${versions:zope2-url}
fake-zope-eggs = true
# <http://n2.nabble.com/-tp1462235p1509921.html>
additional-fake-eggs =
    ZConfig
    ZODB3
    pytz
skip-fake-eggs = 
    zope.testing
    zope.component
    zope.i18n

At the root of my installation I find two versions of Zope: 
omnium:zeocluster centrimadmin$ ls -l ..
total 0
drwxr-xr-x   6 root  admin  204 Feb 15  2009 Python-2.4
drwxr-xr-x  16 root  wheel  544 Jan 21 09:03 Zope-2.10.11-final-py2.4
drwxr-xr-x  17 root  wheel  578 Feb 15  2009 Zope-2.10.7-final-py2.4
drwxr-xr-x   4 root  wheel  136 Dec 15  2008 buildout-cache
drwxr-xr-x  17 root  admin  578 Jan 21 00:38 zeocluster

Comparable errors reported by Dale DeWitt in September
<http://n2.nabble.com/-tp3677065p3677065.html> and November 2009
<http://n2.nabble.com/-tp4044570p4044570.html>. Dale and I both use
plone.app.blob with Plone 3.3.x. 

TIA for any advice
Graham
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