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Hi Mchv2.0,
Regarding "all domains are allowed", do you mean you have added the domains in Site Settings > Site Collection Administration > HTML Field Security > Allow iframes from this domain?
If yes, could you please check whether the following test script can be added into the page? (Edit page > Insert > Web Part > Media and Content > Script Editor > EDIT SNIPPET > paste the following code )
<iframe width="480" height="270" src="https://www.ustream.tv/embed/recorded/40949595?html5ui" scrolling="no" allowfullscreen webkitallowfullscreen frameborder="0" style='border: 0 none transparent;'></iframe>
Meanwhile, to help identify whether the error is related to the specific code, we would be appreciated if you can share with us the code in the workspace.
Thanks,
James
SRC Edited in 4/24/2016