Why isn't my pinterest Pin It button working any more for YouTube videos?

[green_earrings]

My Pinterest Pin It button was working just fine. Then, suddenly today it stopped working, but only for YouTube videos. ANY of them. It doesn't matter what I try to pin, when I click Pin It for the video, it gives me the little image with the "Pin It' symbol on it, but in the window that always appears after that, where I can choose which board, add comments & finally pin, all it says is something to the effect of "sorry, this source is blocked because it may contain spam or other objectionable material".

It doesn't matter which videos or type of video I try to pin; I've tried dozens of different types, even ones I've pinned previously without any problem. I removed my Pin It button and replaced it. I even deactivated my account and opened a new one. It doesn't matter if I used my laptop w/ Windows 7, or the Mac in my home.

My computers are working fine, and just to note this is only happening with YouTube. Vimeo videos pin just fine, and pinning images works just fine too.

Has Pinterest stopped allowing pinners to pin videos from YouTube?

Any help would be appreciated. Thanks in advance.