Dear Sam,
my guess would be that there are different SPM versions in your MATLAB path. Issue the command
which -all spm_hrf
in the command window. It should return only one instance of spm_hrf and this should reside in the folder of your SPM installation. If there is more than one file, check the other files, clean up your MATLAB path and try again.
Hope this helps,
Volkmar
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