Bug in HDF5 interface?

Hi everyone.

I am using Pauli Virtanen's excellent hdf5 script h5load to read hdf5 datafiles which contain data formed in structs.

Now, I get into some trouble when I try to load a .mat file using the simple load('path-to-file-in-question') which fail with the error

attempt to create or open handle failed
??? Error using ==> load
Can't read file

Pauli's script uses the call

loc = H5F.open(filename, 'H5F_ACC_RDONLY', 'H5P_DEFAULT');
try
  data = load_one(loc, path_parts, path);
  H5F.close(loc);
catch exc
  H5F.close(loc);
  rethrow(exc);
end

Does the call to H5F somehow affect the call to 'load'?

It gets weirder.

if I do a 'save' from the matlab prompt I get a default file matlab.mat, which I can load without the error mentioned above. However, the file I open from my script now has a hdf5 header,

hdf5info(filename)

ans = 

            Filename: 'Ofilters1.mat'
          LibVersion: '1.6.5'
              Offset: 512
            FileSize: 474197
      GroupHierarchy: [1x1 struct]

Using MATLAB 2007b 64-bit on Windows 7

References: http://www.mathworks.com/matlabcentral/fileexchange/23934-hdf5-data-to-struct-reader/content/h5load.m