Hello @Josh_Weir, looks like the problem is that your computer or browser does not fully meet the system requirements. Please consult this tutorial in which you can find the system requirements and the list of supported browsers. Also I would suggest making sure a firewall or another security software is not preventing you from accessing Prezi. If you have any other questions or need further assistance feel free to reach out to us.
Hello @Josh_Weir, can you please try deleting cache and cookies in your browser? Let me know if this solves the problem.