I have seen recently that no video is showing on the View Stream link, just an Audio only screen.

This may be down to Browser Permissions. We are unsure why this has happened or if it is a Firefox browser only issue. Try using a different browser.

The View Stream option shows a black image which is Audio only.

The browser Address bar has a Permission icon to the left of the URL in the address bar. (I see this in Firefox)

Then a browser refresh should show both Video and Audio

Ensure that ALLOW is selected for Video and Audio.

I have discovered that Firefox may well be the issue, when the settings for privacy were reset back to Standard, all the videos started playing. I had noticed that embed videos also stopped working.