Related posts thumbnail served over HTTP

Hi there,

I'm currently setting up EasyBlog on our site which runs wholly under HTTPS.

We have the Related Posts enabled to display at the bottom of blog posts but they are generating a Mixed Content warning in the browser due the post thumnbails all being called in via HTTP:

<a href="/the-new-sane-blog/leave-work-early-staying-back-may-be-unproductive" class="eb-related-thumb" style="background-image: url('http://dev.sane.org/images/easyblog_images/143/b2ap3_thumbnail_41b3e1c9a72563adbb791550ecdbe3a5_XL.jpg') !important;"></a>

It can be viewed here:

https://dev.sane.org/the-new-sane-blog/mens-mental-health-how-to-seek-help

The whole image url is being called in to the template with the following:

<?php echo $related->postimage;?>

Is it possible to force EasyBlog to server everything over HTTPS, or worst case scenario is there a file I can modify to have this image served over HTTPS?

Thanks