Our institution offers two courses per term using Mastery Paths. The last term and the current present various issues: the most serious one being that some students cannot view the whole content. In the diagnostic module, there is a test that divides students into two groups according to score and that one is set with Mastery Paths; for the rest of the modules there are requisites and prerequisites (that seems to work fine).

For reasons we cannot yet figure, some students can see pages and do activities and exams without any problems, and others simply have empty modules! (there are 700-2,000 students, so it is not an easy tsk to do a follow-up of each incident).

We have troubleshooted this by manually assigning quizzes or even changing the initial test settings to include a second try (which means all students must re-submit), but look forward to an actual solution. Any suggestions?