It appears that the flag template is broken, as it no longer shows the flags appropriately.
In the examples on this page (FlagTemplate) I just see the names of the countries, i.e. the alternate text for the images.
In Firefox’s Inspector I see, for example:
<img src=" http://egc2009.nl/sites/default/files/icons/gif/nl.gif" alt="Netherlands" title="Netherlands (image inlined from egc2009.nl)" border="0"> ::before </img>
and when I hover over the URL with the mouse I see ‘Could not load the image’, yet when I copy the URL and paste it in the address it shows me the image just fine.
I also see a message:
Firefox is showing me the page FlagTemplate with:
in the address bar, which, they say,
which sounds as though I ought to be seeing the flags.
On the other hand, pages such as Full Recent Changes display with a green lock indicating a fully secure page.
I tried out using the {{:img}} template on my home page with HTTPS:, but that did not help; it get the impression that egc2009.nl does not support HTTPS. Firefox also says that I can use a preference to determine whether it blocks mixed display content, but the only one I could see made no difference. In about:config I see
security.mixed_content.block_display_content;false
which sounds as though it should not be blocked. The documentation at https://developer.mozilla.org/en-US/docs/Web/Security/Mixed_content?utm_source=mozilla&utm_medium=firefox-console-errors&utm_campaign=default also makes it sound as if I should see the mixed content.
I'm on Firefox (v67, Linux) and can see the flags. If they are not shown on your browser then I'd guess that it's either a "mixed content" issue (unlikely, based on your description) or some plugin (e.g. an ad blocker) that mistakes the flags for an ad or malicious tracker. (egc2009.nl blocking your requests is unlikely.) There's nothing I can do on our end to help in either case :o(
The only thing that would solve this for sure: hosting the flags on SL.
Thanks, you were dead right: I use Ghostery? to avoid tracking cookies, and although it reported nothing detected on Flag Template, the moment I disabled it for Sensei and refreshed, the flags reappeared: mysterious but satisfactory!
It seems that website itself is down and that's why none of the flag templates work?