When you can't see fields to enter grades and comments

It is not uncommon when you go to a class page find that columns (Grid View) or fields (Student View) appear missing, try checking your 'View' settings

The following example is in a Student View, if you are in Grid View the button is the same.

Issue: I can't see any Semester 2 fields.
Resolution: Click View and select S2 items from the drop-down menu.