I am afraid I donāt knowā¦
I know that due_date
vs start_date
is a particularly tricky issue with SuiteCRM, because of the aggregating subpanel called āactivitiesā, which uses dates from several modules and tries to make sense of them. There have been several bugs and regressions with these fields in that subpanel.
But I am not sure what is supposed to be going on in the calendar.
This thread has some info about the fullCalendar options to make things draggable: