The format of posting YouTube videos to Facebook has changed. The selection of where I can post on Facebook makes no sense-friends of friends, etc. When I post a YouTube video to my wall only, nothing appears there, as then I would re-post it to a group. I can only think it's my older Mac computer or there is a setting somewhere I can't find. I cannot post to a group, it doesn't give me that option and I can't seem to create that option; I preferred the older set-up better I would mean that I would have to post to friends to get it on my wall (maybe) and then re-post it to a group, if I'm given that option-sometimes there is no ability to share on your post.
I have 4 Facebook pages, I experienced this as well, and here is how I solved it:
After clicking the "share" button underneath the video, I then select the blue "f" (Facebook) graphic link BEFORE the window pops up.