Most likely, you are a victim to the DRM change that started on January 25th that you've probably already read about in the banner and throughout messages on the forum. That's not going to change until the Developers can crack the keys for the new DRM. We have been told "soon" but we also heard that earlier. The only thing I can say is they are working on it.
As for YouTube+/DRM MPD, they are two different file streaming protocols. YouTube uses primarily a variation on the Apple HLS or M3U streaming protocol, if I'm not mistaken. A newer protocol is DASH or MPD. Usually a site will use one or the other, but they can use both. It's possible that all your previous downloads were M3U8 and the ones you are now trying to get are DASH. Or the DRM change has confused StreamFab so much that it doesn't know if it is dealing with M3U8 or DASH. Kind of unlikely, but you never know. Once the DRM fix comes out, you'll get a clearer picture of what was going on. Unfortunately, you aren't going to get any of your lectures until the DRM problem is fixed.
