I have an assignment that is visible to the students, and to me, in the assignment list yet we cannot see it in the grade book. The category is visible. Regardless of setting, is the eye in the assignment the same as the "eye" in the grade-book? If not then it would explain the issue but that doesn't makes sense.
I noticed something that may be linked: I did a lot of moving of individual, and blocks, of assignments. At times, the assignment menu would indicate "Show" when it is actually hidden and vice versa. It seemed to correct when I exited Moodle and restarted it.
For the assignment in question, I set the grade book entry to visible and now it seems to be available to students.
I am sure that it is confusing but it did happen.
Anyone else?