Hello!
I just downloaded version 13.o and loaded a project I was working on. When I tried to run the first level analysis, I got this error:

??? Error using ==> save
Can't write file D:\ ... \conn_allPts_pre\results\firstlevel\ANALYSIS_01\resultsROI_Subject001_Condition001.mat.

Error in ==> conn_process at 1395
save(filename,'Z','regressors','names','names2','xyz','SE','DOF');
Error in ==> conn_process at 21
case 'analyses_gui_seed',disp(['CONN: RUNNING ANALYSIS STEP
(ROI-to-ROI or seed-to-voxel analyses)']);
conn_process([10:12,15],CONN_x.Analysis);
Error in ==> conn at 1988
conn_process('analyses_gui_seed',CONN_x.Analysis);
Error in ==> conn_menumanager at 116
feval(MM.MENU{n0}.callback{n1}{1},MM.MENU{n0}.callback{n1}{2:end});
??? Error while evaluating figure WindowButtonUpFcn

I thought maybe this was due to some sort of incompatibility with an old file and the new software. So I loaded one that hadn't been preprocessed yet and got this:

??? Error using ==> save
Can't write file D:\ ... \REX.mat.

Error in ==> rex at 154
if
strcmpi(params.output_type,'save')||strcmpi(params.output_type,'saverex'),
save('REX.mat','params'); end
Error in ==> conn_rex at 8
[varargout{1:nargout}]=rex(varargin{:});
Error in ==> conn_process at 480
[data{nroi1},namesroi{nroi},params]=conn_rex(Vsource,Vmask{nroi},'summary_measure','mean','conjunction_mask',mask,'level',level,'scaling',scalinglevel,'select_clusters',0,
Error in ==> conn_process at 11
case 'setup', disp(['CONN: RUNNING SETUP STEP']);
conn_process([0:5]);
Error in ==> conn at 1177
conn_process('setup');
Error in ==> conn_menumanager at 116
feval(MM.MENU{n0}.callback{n1}{1},MM.MENU{n0}.callback{n1}{2:end});
??? Error while evaluating figure WindowButtonUpFcn

I'm wondering if I've messed up the installation. Any and all suggestions on how to fix this are greatly appreciated.
Thanks!
Chaleece

FYI -- this was an issue with storage space (of all things).

Thanks Chaleece, for letting us know about the solution. It saved me from a lot of confusions.