The grades will refresh if students visit the assignment again after the refresh period.
I have a related problem. During the summer semesters grades are due a day after the final exam, in less than 24 hours. Our grade pass is set to refresh grades every 24 hours. It also requires that a student visits the homework assignment. Sometimes what happens is that students don't go to the homework anymore (especially if Blackboard closes access for them after the semester ends) and the grades are not refreshed. I see that by comparing grades in WeBWorK and Blackboard.
In these cases I "enter student preview" in Blackboard and visit the assignment myself so that grade transfer is re-initiated. It takes a few minutes.
I have a related problem. During the summer semesters grades are due a day after the final exam, in less than 24 hours. Our grade pass is set to refresh grades every 24 hours. It also requires that a student visits the homework assignment. Sometimes what happens is that students don't go to the homework anymore (especially if Blackboard closes access for them after the semester ends) and the grades are not refreshed. I see that by comparing grades in WeBWorK and Blackboard.
In these cases I "enter student preview" in Blackboard and visit the assignment myself so that grade transfer is re-initiated. It takes a few minutes.