Dear Robert

I could overcome my previous problems of not having root privileges, so it all worked up till the command:

./postproc.py cylinder.vtk

This echoed the below message:

Exception
In /home/gmh/.local/lib/python2.7/site-packages/mayavi-4.4.4.dev0-py2.7-linux-x86_64.egg/mayavi/sources/vtk_xml_file_reader.py:86
AttributeError: 'AlgorithmOutput' object has no attribute 'point_data' (in get_all_attributes)

Traceback (most recent call last):
  File "/home/gmh/.local/lib/python2.7/site-packages/traits-4.6.0.dev354-py2.7-linux-x86_64.egg/traits/trait_notifiers.py", line 340, in __call__
    self.handler( *args )
  File "/home/gmh/sfepy/sfepy/postprocess/dataset_manager.py", line 177, in _dataset_changed
    self._assign_attribute.input = value
  File "/home/gmh/.local/lib/python2.7/site-packages/traits-4.6.0.dev354-py2.7-linux-x86_64.egg/traits/trait_handlers.py", line 104, in _read_only
    name, class_of( object ) )
TraitError: The 'input' trait of an AssignAttribute instance is 'read only'.
sfepy: point scalars t at [-0.05 -0.02  0.  ]
sfepy: range: -2.00e+00 2.00e+00 l2 norm range: 1.06e-02 2.00e+00
No handlers could be found for logger "mayavi.core.common"


I'm using Python 2.7.8 if that's relevant to the current issue.

Thanks again
Cheers