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OK, Jack, here is your info:
  - 10.2.6
  - Python 2.3b2+ straight from CVS (only way to code =)
  - HFS+ I believe (Finder says my HD is Mac OS Extended)

Ran the test from my CVS tree with my installed version of Python 
2.3b2+ (I can't do anything the standard way).  I just ran it with 
the installed copy from the installed test directory and got the 
errors.  I also just ran it with the compiled copy but not installed 
Python executable in my CVS tree and once again got the error.

I noticed this came up, for me at least, when I was checking a 
patch for posixpath.py (which was applied to CVS).  I checked the 
code, though, and didn't find a problem where anything changed to 
posixpath.py would affect it.