Hi Matt, Brian,
Thanks for getting back to me!
Just re-built the course using the latest version of the framework- still no luck! I'm getting the same error when I try it in IE11 (still works fine in Chrome and Firefox).
Matt- I am using the Framework, not the Authoring Tool. I have set the width and height in the component, it looks like this:
Have I got the width and height wrong? These were the default values in the example.json.