Uninspiring wee grey Youtube video icon

[forresthowie]

Hi all,
I'm able to add YouTube videos to my page (yey), but I can only seem to have them show up as a rather uninspiring wee grey 'video' box. I can't seem to either get the placeholder to show the image I have as the placeholder OR what's on the Youtube video. All I get is what you can see in the attached image. This is the same whether I have the 'regenerate placeholder image...' box ticked or not.
Anyone got any ideas as to what I'm doing wrong?
Much oblighed.
Yours,
Robert