There are many issues that may prevent a web page from displaying in LiveSlides including:
If you’re presenting Flash content, like Prezi, make sure you have the latest version of Adobe Flash installed on your computer. You may install flash by visiting the Adobe Flash Player website.
If a website’s SSL certificate is improperly configured, LiveSlides will display a blank white screen. Visit the website you’re trying to present in Chrome or Safari and verify no security warnings appear.
If a website is behind a firewall or experience other issues, it may not display correctly in LiveSlides. Contact that websites support team for more assistance.