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Brett, I've seen this bug once in a while, but whenever I try to 
hunt it it disappears. Could you give me the following info:
- OSX exact version
- Python exact version, plus where you got it from (binary install, 
source tarball install, CVS)
- Type of filesystem (HFS+, UFS, NFS, something else)

Also, if you're building from source, did you run the tests from the 
build tree or from the installed tree? Could you try the other one 
too?