Problem:
Students with Macbooks and Safari are having problems accessing Inclusive Access materials in MyClasses via the Required Course Materials link on the course menu.
Solution:
On your Mac in Safari select Safari > Preferences > Privacy.
Uncheck the option "Prevent cross-site tracking"
Restart the browser and try logging in again.
If this does not resolve the issue you can try another browser(ie: Google Chrome) to see if the problem persist.