A blue Pause icon on a module means that this module is currently incomplete. Here's what to do to complete the module and proceed through the course.
Select the module with the blue Pause icon, and click the TOC (Table of Contents) icon in the top right corner of the module.
The list of sections for that module will be displayed. A symbol of an open lock is visible beside each completed section.
Click each section with closed lock symbols in order to view and therefore complete the module.
All module content within each course must be completed in order to unlock the Mastery Exam.