LinearRing creation causing WindowsError

I updated Django today to trunk (last update was Oct 2010) and I'm now
getting an error when creating a LinearRing object.
The following from a python shell will produce the error:

from django.contrib.gis.geos import *
test = LinearRing ( [ (1,1), (2,1), (2,2), (1,1) ] )
test

Accessing 'test' with the last line above causes the following error
to occur:

WindowsError: exception: access violation writing 0x0291CC80

(the string of chars following the 0x will naturally vary)

As best I can tell, I have GEOS 3.2.2 installed (and will happily give
more information if it helps).
(I say 'As best as I can tell' as this is what is reported when I run
"select postgis_full_version()" from psql command prompt and the
PostgresSQL\9.0\bin is the only entry in my PATH variable that I can
see that would point to the GEOS binaries).

I can run the same python code on a Linux machine (with the latest
Django and GEOS 3.3.2) and I get no error (not sure if it's the GEOS
library version or the OS that's making the difference...).

Any ideas?

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