The latest update (Moodle 2.0 Preview 4+ (Build: 20100827) ) appears to break the teacher role.
When assigning the teacher to a course the teacher does not receive editing permissions to the course.
This was tested on the qa site and three other test sites.
Tracker Ticket: http://tracker.moodle.org/browse/MDL-23972
Testing and QA
Moodle P4 - Teacher Role - Broken
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