When I designed the spreadsheet, 12-16 Lab WU, I locked certain cells and protected the worksheets. Locked cells are locked because they contain formulas that make the calculations work. Without the formulas, the grader is useless.
When you unprotect a worksheet you create the possiblity that formulas will be overwritten or deleted. If you do this, you will have fix the broken formulas or download a new 12-16 Lab-WU Grader and re-enter the student information and scores into the new grader. I will not fix it for you. I recommend that you keep the worksheets protected. If the worksheets are protected, the formulas are protected.
The illustration below highlights the locked cells in worksheets 1-12.
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