Roles and permissions

I backed up/restored courses to a new Moodle and now when students try to view an assignment they get:

Sorry, but you do not currently have permissions to do that (View assignment)


Teachers were also having issues viewing the assignments until I made them global admins.


Any help is greatly appreciated - I don't know if this is a roles issue or backup/restore? I'm not using groups. I think it's a roles issue because I manually added a user in the new Moodle and a new course and the student could not view the assignment! Please help! Thanks!