@Adrian_Shaffer, we have checked the account, and every seems to work correctly on our end. Could you please try using the latest version of Google Chrome?
Also, to make sure that your firewall or security settings are not preventing your computer from accessing Prezi, please take the following steps:
Check that this is also the case with any firewall software, browser privacy add-on, or similar software that you may be running on your computer.
Please make sure that pop-ups are allowed in your browser privacy add-on or firewall software for: