A couple of things to check:

Subscription Status:

• • go into a lesson > hamburger icon > account settings > change email subscriptions.  
  • Should be "immediately."  (Note: this is turned off if you click unsubscribe link in email)

 Role assignments:  

• • go into a lesson > hamburger icon > Manage Role assignments.   
  • Are you listed in all of your courses?

Catching-up:

If you had to fix one of the above and are worried about tests that happened during the problem, just use your Dashboard to catch-up.

• • go into a lesson > hamburger icon > View Report Dashboard.   
  • You can catch all the ones requiring grading in the first box.
  • You can scan student progress that you missed in the second.