Several possible ideas:
1. On windows, you will be using Internet Explorer inside of DashBoard so that's the one to focus on
2. When Compatibility Mode is enabled by default (and this can cause some problems with more advanced browser features). Make sure your page is disabling compatibility mode by using ``
3. If the page is completely white, are you sure DashBoard is pointing to the correct page? Try including a bit of text around the embedded video to see if that shows up in DashBoard.
#DashBoard