I have received an error message I have not seen before in preprocessing of data in Conn version 18.b. I am running the standard preprocessing pipeline, and after the first step (Functional realignment and unwarp) completes, I get the following error:

ERROR DESCRIPTION:

Error using matlab.ui.control.UIControl/set
Invalid or deleted object.
Error in conn_disp (line 157)
set(CONN_h.screen.hlogstr,'value',[]);
Error in conn_msgbox (line 40)
if ok==0, conn_disp(char(txt)); end
Error in conn_setup_preproc (line 2578)
if dogui, hmsg=conn_msgbox({'Importing results to CONN project','Please wait...'},'');
Error in conn (line 1081)
ok=conn_setup_preproc('',varargin{2:end});
Error in conn_menumanager (line 120)
feval(CONN_MM.MENU{n0}.callback{n1}{1},CONN_MM.MENU{n0}.callback{n1}{2:end});
CONN18.b
SPM12 + DEM FieldMap MEEGtools
Matlab v.2017b
project: CONN18.b
storage: 661.7Gb available
spm @ C:\Matlab\spm12\spm12
conn @ C:\conn18b\conn

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The 'u' prefixed .nii files are created but not imported into Conn, and the rp_.txt files are created. The processing then stops and does not continue. Any insight into what may be causing this error and how to proceed? Thanks!