With the current `develop` branch built,
```
mark@ls27175:~/src/openmicroscopy$ echo $PYTHONPATH
/Users/mark/src/openmicroscopy/dist/lib/python/:/usr/local/Cellar/zeroc-ice33/3.3/python:/usr/local/lib/python2.7/site-packages
mark@ls27175:~/src/openmicroscopy$ shasum /Users/mark/src/openmicroscopy/dist/lib/python/path.py
55dc82b1f2e39e4d380a304e0e1d99ebd34d9d6b  /Users/mark/src/openmicroscopy/dist/lib/python/path.py
mark@ls27175:~/src/openmicroscopy$ python
Python 2.7.2 (default, Jun 20 2012, 16:23:33) 
[GCC 4.2.1 Compatible Apple Clang 4.0 (tags/Apple/clang-418.0.60)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> from path import path
>>> from omero.rtypes import *
>>> rstring(path("."))
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/mark/src/openmicroscopy/dist/lib/python/omero/rtypes.py", line 284, in rstring
    raise ValueError("Not string type: %s" % type(val))
ValueError: Not string type: <class 'path.path'>
>>> 
```