I had to shut off the iframe checker because it was not allowing youtube video embeds or maps, even though those youtubes were indexed on the site.
I also had those domains listed as "good" in the "checker".
This wasn't happening before, so I'm not sure what caused it, perhaps one of the recent updates? I just tested Npages, discussions, group discussion, and blogs and the problem was everywhere.
Shutting off the checker solved it but of course reduced security.
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Ken Rich
indiegospel.net
updated by @ken-rich: 01/01/15 03:35:25AM