I have one student (that I know of) who cannot see the Settings Block on the course page. As a result, he is unable to view his grades (Settings - Course Administration- Grades). All the other Blocks are showing for him.
I have 2 test accounts as a Student and I have no problem seeing the Settings Block, so I can't figure out why he can't see it. I can also see it in my own account when I switch my role to student.
The Settings Block is configured to Display on page types: Any page. (I have just now set "Allow user to dock this block" to No.)
I don't know if this is related, but I recently changed my Navigation Block so that "Generate navigation for the following" was set to Everything. I don't see how that could have affected it, but perhaps it did?