If you can login and the video is not playing, it is more than likely a buffering issue. This means that the electronic device you are using may be too old or outdated. TROUBLE SHOOTING TECHNIQUES:
1) Shut down computer completely. Let it sit for 1 full minute then power it back on.
2) Use minimal applications and web pages at the same time.
3) Try watching the video from another device. If it works on one device, but not the other, then it will be an issue with the device it does not work on.