Dear Chris,
SPM defaults are coded in spm_defaults.m. They can be changed at runtime using spm_get_defaults('key', value) or permanently by editing spm_defaults.m. In your case, you would need to run
spm_get_defaults('mat.format', '-v7.3')
prior to model setup or you would need to change line 49 in spm_defaults.m from
defaults.mat.format = '-v6'; % ...
to
defaults.mat.format = '-v7.3'; % ...
MATLABs own defaults do not take effect in SPM, and by including both '-v7.3' and spm_get_defaults('mat.format') in your save command you gave two incompatible format instructions.
Hope this helps,
Volkmar
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