Dear SPMers, When I run paired t-test, and go in to define contrast, I obtain error pasted in the bottom of this message. No errors appear during estimation. Also, I checked, and my SPM.xX.nKX does in fact have complex values! Few more pieces of perhaps useful info: error occurs when I run analysis with smoothed data, but does not occur on unsmoothed images of the same dataset (other params set exactly the same). Also, I am running SPM5, and have recently re-installed the updates. Any help or advice would be tremendously appreciated. Regards, -Layla ??? Error using ==> image Error using ==> image Image CData can not be complex. Error in ==> spm_conman at 960 hDesMtxIm = image((varargin{2}.nKX+1)*32); Error in ==> spm_conman at 929 spm_conman('ImDesMtx',xX, H.hDesMtxAx) %-Depict DesMtx Error in ==> spm_conman at 812 [F,cF] = spm_conman('Initialise','on',SPM,STATmode,n,Prompt,Mcstr,OK2chg); Error in ==> spm_getSPM at 278 [Ic,xCon] = spm_conman(SPM,'T&F',Inf,... Error in ==> spm_results_ui at 264 [SPM,xSPM] = spm_getSPM; ??? Error while evaluating uicontrol Callback.