Windows PC: the Taskbar may be hiding the controls. On the bottom of your screen is the Windows Taskbar, and this may blocking the video player, if so please follow the steps below:
1) Right Click on the Windows Taskbar
2) Choose on “Properties”
3) Check the box that says “Auto-Hide the Taskbar"
You should now see the video controls.
Chrome users on Mac or Windows PC may have silverlight disabled, this is hiding the video controls. Here are the instructions to enable it: http://www.howtogeek.com/217251/how-do-i-enable-silverlight-in-google-chrome-version-42-and-later/