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This problem has been fixed in the latest May snapshots available from:
ftp://ftp.ncsa.uiuc.edu/HDF/pub/outgoing/hdf5/snapshots/
The hdf5-1.4.1-post* snapshots contain bug fixes to the current released software (hdf5-1.4.1).
The hdf5-1.5* snapshots contain the code that is under development. This code is of interest primarily in research and development environments.