If you are having issues with components in the course, here are some suggestions:
Try restarting your computer.
Clear the cache and cookies in your Chrome browser. (how to)
Turn off your extensions or pop-up blockers. (how to)
If you are using your school-managed G Suite account, contact your district technology staff to ensure no content/ad/pop-up blockers have been installed by your district.
Make sure Chrome is updated. (how-to)
Try another browser to see if you can access the items there.
How is your internet connection? Can you improve it?
Do you have another device to try?