No video, only sound in Safari embedded YouTube videos

I've noticed this past week that on both iPad and iPhone, videos from YouTube which previously played straight from Safari (embedded in a blog etc.) suddenly no longer play. That is, on the iPad it tries to play – I get sound but no video; I just see the original web page with a black box where the video should go. On the iPhone it doesn't even get that far. iPad is currently using the 4.3.5 system software. iPhone is a 4 running 4.3.3. Is anybody else having this problem, and any idea of a fix?

Thanks for the quick reply. I've tried each of those now on both devices and it hasn't made any difference I'm afraid. I've found a work around – clicking the YouTube icon lower right of the video frame opens the video in YouTube in a new tab, and that plays fine, providing I haven't already tried to play it in its embeded location. This is a little problematic as I'm hosting a site with YouTube content, and other people accessing it via an iOS device won't know whether they need to click the icon until after they've tried hitting the play button in the centre...
The video on the page below is a good example. Embed code is straight out of YouTube, and Syndication is set to on. Android users and iPads with older software versions have had no problems it seems.
http://www.tokyoebisuren.jp/article/0028102.html

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No video, only sound in Safari embedded YouTube videos

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