One of my instructors reported that a student in her class correctly answered all the parts in section 1 of a scaffold problem, but section 2 did not open so the student was not able to continue. Here is a screenshot after grading the student's work in section 1.
You can see that the answers in section 1 are all correct, but the title bar for section 1 is still yellow and the title bar for the section 2 (Algebraic Manipulation) is still grayed out.
What is odd is that this student appears to be the only student for which this has happened. Other students in the class have successfully completed both sections, and when I accessed the problem as a test student, section 2 opened immediately after submitting the three correct answers in section 1 for grading.
As far as I can tell, there are no errors in the pg code for the scaffolding (file is attached). So I am at a lost as to why this one particular student has this issue. I have resolved it for her by making a copy of the problem and deleting the scaffolding, then editing the homework assignment for this one student to use the revised version. But I would really like to understand what might have caused the issue in the first place in case it happens again. Any ideas?