Had xLights hang twice when saving the attached sequence - which has one model and two effects in it.
I think it may be when you save the sequence and have unsaved changes in the layout section.
The first time I tried to save the sequence when the Save button on the layout was red and had to end xl via the task manager after a few minutes.
I then opened xlights , and it saved the sequence no problem.
So I then deleted one of the model groups which had an effect on it , did NOT press save on the layout (Save button still red) and tried to save the sequence again.
(I think that the attached log files are after the delete and before the Save attempt). Again it hung.
Why am I repeating this strange behavior

? Updates to the quick setup section of the manual.