Hi, > I use SPM'99 on my Mac OSx, and it works fine. However, when trying to use > Marsbar (0.23) to: > Design>Estimate roi(s), I select SPMcfg.mat, then region_box_roi.mat, > summary function=mean, an error message appears (below). I think (hope) this is covered in the FAQ: http://marsbar.sourceforge.net/faq.html Best, Matthew