youTube extension

Hi

I am getting a blank screen after submitting a youTube url into a post.

Here is the template:

<perch:if exists="introduction">
<section class="sectionWrapper">
        <div class="container">
            <div class="sectionLabel">
                <perch:content id="introduction" type="textarea" label="Content 1/3 grid" markdown="true" editor="markitup" size="s"/>
            </div>

            <div class="sectionContent">
                <perch:content id="video" type="youtube" label="YouTube video URL" output="embed" width="1000"/>
            </div>

        </div>

</section>
</perch:if>

Here are my diagnostics

Perch: 2.7.10, PHP: 5.4.34-0+deb7u1, MySQL: 5.5.40, with PDO Server OS: Linux, apache2handler Installed apps: content (2.7.10), assets (2.7.10), categories (2.7.10), perch_blog (4.5.4), perch_forms (1.8.2) App runtimes: <?php $apps_list = array( 'content', 'categories', 'perch_forms', 'perch_blog' ); PERCH_LOGINPATH: /perch PERCH_PATH: /home/adammench/public/declutterme.london/public/perch PERCH_CORE: /home/adammench/public/declutterme.london/public/perch/core PERCH_RESFILEPATH: /home/adammench/public/declutterme.london/public/perch/resources Image manipulation: GD PHP limits: Max upload 200M, Max POST 24M, Memory: 200M, Total max file upload: 24M Resource folder writeable: Yes HTTP_HOST: declutterme.london DOCUMENT_ROOT: /home/adammench/public/declutterme.london/public/ REQUEST_URI: /perch/core/settings/diagnostics/ SCRIPT_NAME: /perch/core/settings/diagnostics/index.php

Other areas of the site work well, it seems it is the youtube content type that is crashing the perch back end.

Any ideas?

Thanks

Adam