У вашего броузера проблема в совместимости с HTML5
Isadora's potential can be greatly expanded through the use of Secondary Scenes; extra scenes that are activated in addition the primary active scene. This tutorial illustrates this feature by addressing the common need to play music in the background while moving through other scenes. If you have a question, please ask it in our forum instead of here. Visit https://community.troikatronix.com for help and answers.