Hi Mary and Hartmut,
I see the exact same behavior...teachers cannot see the rubric like admin and students can when they select the assignment. That capability is controlled by the Submit assignment setting for the Defined role for teacher. By default, it is not checked for teachers, non-editing teachers, and managers, like it is for students.
If you want teachers to be able to see the rubric when they select the assignment, go to Site administration > Users > Permissions > Define roles > then select Teacher. While Viewing the definition of role 'Teacher' click on the Edit button. Scroll down until you find Submit assignment, and add a checkmark to the Allow box. Scroll to the bottom of the page and click Save changes. Check and now teachers should see the rubric.