Using the web version of AppStudio for ArcGIS, I have created and configured a Landing Page... When I am signed in, I am able to edit, save, and view the Landing Page correctly:

However, when trying to access this page without singing in (aka, anyone public trying to access the site), I get the following result:

I have tried a different combination of images, and get the same result... I have also tried the hosted version of this (http://appstudio.arcgis.com/landingpage/ea1f272052164c9f8f2a1f7e70c4133b/) and have downloaded it to a local server (http://arcgis103.esri.ca/uc2016/animal/) - same results...
Any advice on how to proceed would be greatly appreciated... Thanks!