I am using Version 2.1.4. Maybe I should update my WeBWorK installation?
In the "Set Assigner" menu I selected a student on the left and a set on the right.
I don't have the same message/button that you describe.
I have buttons
* Assign selected sets to selected users
* Unassign selected sets from selected users
Followed by the text
Do not unassign students unless you know what you are doing.
There is NO undo for unassigning students.
When you unassign a student's name, you destroy all of the data for
that problem set for that student. You will then need to reassign the
set(s) to these students and they will receive new versions of the
problems. Make sure this is what you want to do before unassigning
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