Running into problems embedding youtube vids & I can't figure out why...

(Using web designer MX v 8)

I grab the youtube widget & drop it onto my page. Then I find the video I want, select 'share', then 'embed', then copy the html code (I tried control+C and also right-clicking & 'copy' - doesn't make any difference unfortunately). Then I click 'insert' and it pops up a warning that there's nothing on the clipboard. I also tried to copy / paste into the 'placeholder' tab on the web properties menu & run into the same thing. When I go to paste the html code into the space, nothing pastes.

Any ideas?

Thanks

Mark