A learner's progress might not change for several reasons:
1) The learner has not completely satisfied all of the requirements set into place.
2) A learner has not spent enough time on a module in order to get a check mark of completion, such as in the case of a video.
3) A learner has not received the minimum grade in order to complete the module.
4) A learner has not submitted the assessment successfully.
*Many times, learners forget to click I am Finished on an assessment. Failure to do so will make the assessment stay in a limbo-like state -- something that a learner thinks they have finished, but does not notify admins or give completion credit.