We are so sorry you are having trouble. However, we have 15k users and no one else is reporting this issue, which means it is a setting on your computer or device.
Please restart your computer and try the course again. If that doesn't work, follow these quick and easy steps: Tech Solutions
Until you resolve the issue, your student can use the PDF of the Textbook Pages, linked just below the lecture, which includes the Practice Set, to complete the assignment offline. Then, when you have resolved the issue, enter your answers in the eLearning course for grading.
If you need further assistance or prefer a tech to call and walk you through this process, please Contact a Tech Specialist