Volkmar and others,
I've made progress on identifying the problem, but I still need help with a fix. The original error message included this line:
Error in spm_peb_ppi (line 241)
Sess = SPM.Sess(xY(1).Sess);
This actually is looking for a variable SPM.Sess.Sess from the VOI file, which I created from pressing the Eigenvariate option after running some results. The SPM12 version does not create this field. (It does create the SPM.Sess structure, but this does not include another Sess field.)
If I create the VOI file from SPM8 rather than SPM12, there is no problem -- the PPI process runs fine.
So to solve the problem: either the output file from the Eigenvariate function in SPM12 needs to restore this SPM.sess.sess field, or the PPI function in spm_peb_ppi needs to find the necessary information from a different variable.
Doug Burman
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