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I am trying to load a vimeo video into a single page, but it is telling me:

Given URL is not allowed by the Application configuration.

but on other pages the same iframe, copied and pasted into a page template, works fine.

<iframe src="http://player.vimeo.com/video/4426465" width="400" height="230" frameborder="0"></iframe>
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When you say "single page", you mean when you view a blog post page? And when you say "page template", you mean when you view a blog "page", like About Us? – Dan Gayle Sep 20 '10 at 17:09
Yes and yes. single = single.php, page = page.php – Mild Fuzz Sep 20 '10 at 17:25
Please add a link that is demonstrating the problem otherwise this is too hard to answer. – hakre Dec 25 '10 at 14:09

I assume this is message given by Vimeo? In that case it's probably better to ask them.

I know that WP likes to strip out iframes completely, but if it did get to display nothing more WP can break.

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WP strips out iFrames? I have plenty of them – Mild Fuzz Sep 15 '10 at 18:22
Not by default, but it's common if you switch between HTML and visual editor for example. – Rarst Sep 15 '10 at 18:37
this code is going straight into the theme files. – Mild Fuzz Sep 15 '10 at 18:38
In that case it's extremely unlikely for WP to do anything to it. – Rarst Sep 15 '10 at 19:07
It's not. Definitely. The iframe is launching, it's just not rendering. – Mild Fuzz Sep 20 '10 at 17:24

It's not. Definitely. The iframe is launching, it's just not rendering

Then it's hardly a WP question... Time to call Vimeo support.

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