Music course consisting of listening assignments set up as Offline Assignment Activities. When checking student's Progress Bar status I noticed that for all the students all the blocks bar one were red. This struck me as strange since I figured that they would be doing at least some of the work. Upon further probing it emerged that all the red blocks corresponded to Offline Assignments (and the green one to a Resource). Cross checking the access logs showed that students who had accessed an Offline assignment were still showing the associated Progress Bar block as red. A bug methinks.