I updated my site to 3.5.1 and found, in just one instance, that [iframe] isn't seeing the height and width settings in the shortcode with a youtube video. I've compared this to other posts where I use [iframe] and they are working just fine. Both those older posts and this newer one have the same exact shortcode settings.
When I edit the html of the page in Chrome's Dev Tools there is no height or width present even though it's in the shortcode. When I edit the html in Chrome I can get it to look like how it did before.
Here is the post I'm having the issues on:
And here is the shortcode:
[iframe height="315" width="560" src="http://www.youtube.com/embed/LOS4lY1sajQ?rel=0" frameborder="0" allowfullscreen]
Any help with this would be really appreciated it.