EDIT

This is most probably caused by binding the fsi viewer flash app via http instead of https:

<div id="images" class="page-part"><object id="default-gallery-viewer" type="application/x-shockwave-flash" data="http://media.bgbm.org/erez/fsi/fsi.swf?&amp;cfg=showcase_presets/showcase_info.fsi&amp;effects=%26quality%3D95&amp;showcase_query=Lapsana%5Fcommunis AND EditWP6/photos AND jpg&amp;skin=silver&amp;showcase_labeltextheight=50&amp;textbox_textfrom=IPTC_WP6&amp;textbox_height=50&amp;param_backgroundcolor=454343&amp;publishwmode=opaque&amp;showcase_hscroll=true&amp;showcase_basecolor=454343&amp;plugins=textbox,fullscreen" style="visibility: visible;" width="620" height="400"><param name="menu" value="false"><param name="quality" value="high"><param name="width" value="620"><param name="height" value="400"><param name="bgcolor" value="#efefef"><param name="wmode" value="opaque"><param name="allowscriptaccess" value="always"><param name="allowfullscreen" value="true"></object><div id="fsi-gallery-viewer">
<script type="text/javascript">
<!--
    var flashvars = {}; // can be used for the swf URI query parameters

    var params = {};
    params.menu = "false";
    params.quality = "high"; // low
    params.width="620";
    params.height="400";
    params.bgcolor="#efefef"; //#454343
    params.wmode="opaque";
    params.allowscriptaccess="always";
    params.allowfullscreen="true";

    swfobject.embedSWF(
        "http://media.bgbm.org/erez/fsi/fsi.swf?&cfg=showcase_presets/showcase_info.fsi&effects=%26quality%3D95&showcase_query=Lapsana%5Fcommunis AND EditWP6/photos AND jpg&skin=silver&showcase_labeltextheight=50&textbox_textfrom=IPTC_WP6&textbox_height=50&param_backgroundcolor=454343&publishwmode=opaque&showcase_hscroll=true&showcase_basecolor=454343&plugins=textbox,fullscreen",
        "default-gallery-viewer" , // id of alternative content
        "620", // width
        "400", // height
        "11", // swfVersionStr (required) specifies the Flash Player version for which your content is published
        false,
        flashvars,
        params
      );
// -->
</script>
<noscript>
  <object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=6,0,65,0" width="470" height="400">
      <param name="movie" value="http://media.bgbm.org/erez/fsi/fsi.swf?&cfg=showcase_presets/showcase_info.fsi&effects=%26quality%3D95&showcase_query=Lapsana%5Fcommunis AND EditWP6/photos AND jpg&skin=silver&showcase_labeltextheight=50&textbox_textfrom=IPTC_WP6&textbox_height=50&param_backgroundcolor=454343&publishwmode=opaque&showcase_hscroll=true&showcase_basecolor=454343plugins=textbox,fullscreen"/>
      <param name="bgcolor" value="efefef" />
      <param name="wmode" value="opaque" />
      <param name="allowscriptaccess" value="always" />
      <param name="allowfullscreen" value="true" />
      <param name="quality" value="high" />
      <embed src="http://media.bgbm.org/erez/fsi/fsi.swf?&cfg=showcase_presets/showcase_info.fsi&effects=%26quality%3D95&showcase_query=Lapsana%5Fcommunis AND EditWP6/photos AND jpg&skin=silver&showcase_labeltextheight=50&textbox_textfrom=IPTC_WP6&textbox_height=50&param_backgroundcolor=454343&publishwmode=opaque&showcase_hscroll=true&showcase_basecolor=454343plugins=PrintSave,textbox,fullscreen"
        width="620"
        height="400"
        bgcolor="efefef"
        wmode="opaque"
        allowscriptaccess="always"
        allowfullscreen="true"
        quality="high"
        type="application/x-shockwave-flash"
        pluginspage="http://www.adobe.com/go/getflashplayer">
      </embed>
    </object>
</noscript><div id="fsi_caption">© Images used on this website remain copyright of the individual photographer.<br> To obtain permission to use images in publications or websites please contact the network at <a href="edit-wp6-cichorieae@bgbm.org">edit-wp6-cichorieae@bgbm.org</a>. Images may be used for personal use, such as PowerPoint presentations, without permission.</div></div></div>

Https however is not supported by media.bgbm.org. the following request fails:

https://media.bgbm.org/erez/fsi/fsi.swf?&cfg=showcase_presets/showcase_info.fsi&effects=%26quality%3D95&showcase_query=Lapsana_communis%20AND%20EditWP6/photos%20AND%20jpg&skin=silver&showcase_labeltextheight=50&textbox_textfrom=IPTC_WP6&textbox_height=50&param_backgroundcolor=454343&publishwmode=opaque&showcase_hscroll=true&showcase_basecolor=454343&plugins=textbox,fullscreen

Therefore we have two options:

A. Enable media.bgbm.org for https
B. Switch to the Universal Viewer #5083

I am assuming that it will not be possible to make the http://media.bgbm.org/ available under https therefore I am setting #5083 as a blocker of this issue.