Indeed, I just saw, when I changed the student back from Drop to Enrolled, WeBWorK automatically reset his status to "guest". I just changed that status back to "student".
I hope that fixes things, but since what I see acting as the student isn't the same thing as what the student sees when he logs in directly, I'll have to await his trying the sets again now.
WeBWorK Main Forum
dropped, re-added student has no submit buttons
This forum has a limit to the number of forum postings you can make in a given time period - this is currently set at 10 posting(s) in 1 day