Dear Alfonso,

I also confronted this problem recently when I used CONN 18.a.  I have used the completely same settings in CONN 16 before, and it works well. The error information appears at the step 5/7: Importing ROI data. Strangely, this error is persistent even I did not import any ROI files. Could you help me to figure out the reasons.

The error information is as follows:

ERROR DESCRIPTION:

Error using horzcat
Dimensions of matrices being concatenated are not consistent.
Error in rex>rex_do (line 725)
cov1=[dataM,detrend(params.covariates,'constant')];
Error in rex (line 179)
[params.ROIdata,params.ROInames,params.ROIinfo.basis,params.ROIinfo.voxels,params.ROIinfo.files,params.ROIinfo.select,params.ROIinfo.trans]=rex_do(params,1);
Error in conn_rex (line 8)
[varargout{1:nargout}]=rex(varargin{:});
Error in conn_process (line 805)
[data{nroi1},namesroi{nroi},params]=conn_rex(Vsourcethis,Vmask{nroi}{min(nses,nsesstemp)},'summary_measure','eigenvariate','dims',CONN_x.Setup.rois.dimensions{nroi},'conju
Error in conn_process (line 16)
case 'setup', disp(['CONN: RUNNING SETUP STEP']); conn_process([0:4,4.5,5]);
Error in conn (line 4447)
else conn_process('setup'); ispending=false;
Error in conn_menumanager (line 120)
feval(CONN_MM.MENU{n0}.callback{n1}{1},CONN_MM.MENU{n0}.callback{n1}{2:end});

Thank you very much in advance!
Yang Yang