[Answered ]-Sorl-thumbnail is not working in django

I had the same problem. After some investigation I found out that my webserver (in my case nginx) had no write access to the MEDIA_ROOT.

Somehow, sorl-thumbnail fails silently in this case. Giving access to the nginx user solved the problem for me.

Are you sure your image link is valid? Try to catch this issue by {% empty %} feature:

{% thumbnail "http://www.aino.se/media/i/logo.png" "40x40" as im %}
    <img src="{{ im.url }}">
{% empty %}
    <p>No image</p>
{% endthumbnail %}

As documentation says:

Using the empty feature, the empty section is rendered when the source
is resolved to an empty value or an invalid image source…: