Does it still happen in Troubleshoot Mode?

Yes, it happens in troubleshoot mode. I just tried it again.

Show the issue, screen record or screenshots would be helpful. I have no issue with the video on WP homepage. see screenshot

Here is a screen shot of the WP home page. When I try to start a video if just cycles, but never loads.

Does it still happen in a new profile? An easy way to test a new profile is to install Developer Edition and see if it happens there or refresh your existing profile.