Does anyone know what settings I need to change so that I can view YouTube videos again?

It's most annoying!

You can't view any videos? Usually when it says "video not available" it's because the video is gone for good. Where does it say this, and does it say anything else?

All is says is:

"We're sorry, this video is no longer available."

It opens properly and the video screen is black and suddenly the message appears on the top.

When I googled this, I see that many people are having this problem. It's not with all videos, but with several.

I appologize for bumping this up....

But wondered if anyone has found out any info.

Tree, I may be misunderstanding you, but if you can see some videos on YouTube, then probably the ones where you get this message, have been removed because of copyright issues.
I look at YouTube a lot, and people post stuff very quickly, and some of it might be up for an hour or so, and is then removed. For example, it was possible to watch the whole of the movie "Juno" on YouTube for a few days. Obviously, the distributers got wind of this, and it disappeared, but the link was still there.
Another example is the Beijing Olympics; clips are being posted very quickly right now, but are removed within hours.

Sad but true, going to see that a lot Now Their Moderation has been uprated Still a lot of Dodgy material there that Does need to be removed