Goeth,
No, you're not crazy. I'm having the same issues. For me, they started today. In the morning I was able to watch a specific video, and a few hours later I started getting that message. I'm unable to watch several videos. I get the "This video is restricted. Try signing in with a Google Apps account." And then when I try to remove the restricted mode, I am able to do so in one of my computers, but not on my phone. I do have a filtering system installed in all my devices, but this was not happening prior to today and I've had that software installed. So it's not that. I am mystified as well. I don't know what is going on and I also don't have the ForceSafeSearch thing. And Microsoft, as usual, is not being helpful. If you do find out what it is, please post again.
Commiserately,
Eliezer
Thank you for breaking the utter radio silence on this - comforting to know I'm not the only soul plagued to heck with this. But I'm sorry to say, Eliezer, that no, I haven't had a peep of help from Microsoft on this highly aggravating problem. I'm really just living with the massive inconvenience and hoping someone will eventually see my (now our) distress signal...
...Is anyone out there onto this issue...?
Yours most baffled,
Goeth