May be it's just me but today the function of video embedding in reply posts suddenly became disabled.. Looks like you still can create video threads but when I hit "video" button in the reply post type (standard or video) nothing happens.
ttt
I posted a video in a thread earlier.
A thread I created called Diaz can win by submission.
Nothing happened either when I selected "video" but I still pasted the embed code in the normal reply space and it posted the video.
Paging Top Men 
BJ Penn Forever - I posted a video in a thread earlier.
A thread I created called Diaz can win by submission.
Nothing happened either when I selected "video" but I still pasted the embed code in the normal reply space and it posted the video.
Thank you. Didn't work in my case as you can see in this thread
http://forum.mixedmartialarts.com/thread/2535756/UFC-exec-ParkeKhabilov-had-fireworks-in-hotel/?&page=1
You have to click on the little icon 'Source' and enter the embed there.
fob -
You have to click on the little icon 'Source' and enter the embed there.
Thank you, kind sir.