When I was running permutations with fspalm an error appeared because it couldn't find the --sig2p-max option when using mri_surfcluster internally.  You can find below the terminal output.

 *Terminal output:

...  

>> >> palm processing complete - running the surface cluster analysis...

/usr/local/freesurfer/subjects/merchi182_thickness_stats/stats/thickness/permutation/lctx/across/across_age_cov_none_0.05/pos/lh.fsgd_subj_gauss003/palm

mri_surfcluster --in fsp_clustere_tstat_fwep.mgz --thmin 1.301030 --subject merchi182_thickness_average --hemi lh --annot aparc --sum contrast.clustertable.summary --no-fixmni --surf white --ocn contrast.ocn.mgz --oannot ./contrast.ocn.annot --sig2p-max

ERROR: Option --sig2p-max unknown

error: mri_surfcluster failed

fspalm --glmdir /usr/local/freesurfer/subjects/merchi182_thickness_stats//stats/thickness/permutation/lctx/across//across_age_cov_none_0.05/pos//lh.fsgd_subj_gauss003 --cft 1.301 --name palm --iters 100 --cwp .05 --onetail: Signal 127

ans =

   255