Something flashes on the "screen" right before the video tries to load but it's gone too quickly to read.
I have a feeling this is a recent youtube change but it renders live feed screensavers impossible if using youtube autoplay URLs. If anyone has a workaround, please share!
Which version of Windows are you running? The website screensaver uses the .NET web forms control, which unfortunately uses Internet Explorer as the engine. It's definitely possible that a recent YouTube change could have broken support for Internet Explorer
Unfortunately for now it looks like we're out of luck. We may end up switching to a different browsing engine for the website screen saver in the future though, so if we do, we'll definitely let you know!