Hi, We got the following error message when running VBM8 with spm8. We checked the dimensions for all the T1 images are the same except that the slice numbers differ between subjects/T1 images. Did this cause the error message? Should the T1 images have the same number of slices in order for vbm8 to run? Thanks much for your help. Ben ************** Initial Coarse Affine Registration.. Fine Affine Registration.. VBM8 r404: .... Skull-stripping Failed 'VBM8: Estimate & Write' Error using ==> eq Matrix dimensions must agree. In file "/usr/local/spm8/toolbox/vbm8/cg_morph_vol.m" (v404), function "cg_morph_vol" at line 89. In file "/usr/local/spm8/toolbox/vbm8/GBM.m" (v404), function "GBM" at line 203. In file "/usr/local/spm8/toolbox/vbm8/cg_vbm8_write.m" (v404), function "cg_vbm8_write" at line 298. In file "/opt/nindsip/spm/toolboxes/spm8/vbm8_r404/cg_vbm8_run.m" (v404), function "run_job" at line 240. In file "/opt/nindsip/spm/toolboxes/spm8/vbm8_r404/cg_vbm8_run.m" (v404), function "cg_vbm8_run" at line 96. The following modules did not run: Failed: VBM8: Estimate & Write