Some times the video player will appear to work properly but there is no apparent way to fast forward or rewind.
The fix for many other people is to install the latest version of Adobe Flash.
Try to update Adobe Flash and ensure it is enabled on your computer / in your browsers.
You can download Flash here. https://get.adobe.com/flashplayer/
If you are still having troubles after installing Flash, please submit a support ticket and we will be happy to help you.