Dear SPM users, I wrote a MATLAB script to run preprocessing on my data, and everything seems to work fine, except for the fact that I receive the following error message during realignment: Warning: Incompatible scalefactor in "file directory" 0.094606~=0.095002. Does anyone know what might be causing this? I am currently using 4D Nifti files, might this be part of the problem? Thanks for your help, Omar -- Omar Mothersill Room 0.18 Neuropsychiatric Genetics Group Dept. of Psychiatry Trinity Centre for Health Sciences St. James's Hospital Dublin 8. Phone: 01 896 2464 Email: [log in to unmask]