Kent, HDF5ImageIO is failing on a number of platforms: http://www.cdash.org/CDash/testSummary.php?project=2&name=itkHDF5ImageIOTest&date=2011-06-03 Also itkHDF5ImageIOStreamingReadWriteTest http://www.cdash.org/CDash/testSummary.php?project=2&name=itkHDF5ImageIOStreamingReadWriteTest&date=2011-06-03 Bill