Gradebook

Hello,

I have run moodle 2.6 and it has many courses and quizzes but the problem is new courses have not contain students in grade book and it shows just teachers otherwise old courses show marks and students in grade book.

I've tried to change sittings and permite everyone in "Graded roles" (students was selected) but problem remain intact.
Please inform me if there is anything could help me.

Omega