SPM5, and I believe the most recent set of updates I installed were Updates 826. That was mid-August. Segmentation was working fine a week ago, so I'm not sure what could be wrong. Although, I did try to process data that was 256x256, while the previous data were all 64x64. These are all FA maps for DTI data. Thanks, Chris John Ashburner wrote: > Which SPM version, and which updates were installed? > > Best regards, > -John > > On Thursday 06 November 2008 18:28, Chris Watson wrote: > >> I've been trying to run segmentation on a bunch of images. However, at >> some point during the first subject, a segmentation violation occurs. >> I've recreated the same exact problem several times now. I've attached >> the message that pops up in the window when it occurs. It has to do with >> spm_krutil.mexa64. Any suggestions for fixing this? >> >> Thanks, >> Chris >> > > >