Three courses in which I am currently enrolled have disappeared from my Canvas. Their assignments are no longer appearing in my calendar, I cannot find them on my "Published Courses" tab, and when I click "All Courses," they are not in that list either. I have tried logging into Canvas in Safari rather than Google Chrome, updated my Google Chrome, and restarted my computer, but to no avail. Please let me know what I should do to ameliorate this issue.