it's a minor change, but it breaks all the links. hopefully they unbreak it. but, i'll fix it as it comes up...

the old format was like this:

https://www.youtube.com/embed/videoseries?list=list number

the new one is like this:

https://youtube.com/embed/unclear_identifier?list=list number

unfortunately, you seem to need to click the actual "share" feature to get that unclear identifier, which i hope isn't temporary.