Hi,
I have the same problem, I agree with @teseo that need a image invoked, but it's hard to find it because it is not clearly defined in the file.
For example:
in my head.php file stands the line >osc_register_script('images-loaded', osc_current_web_theme_js_url('jquery.imagesloaded.pkgd.min.js'));
So, I guess that "jquery.imagesloaded.pkgd.min.js" loads image url , but in that js. script I did not see the way to locate string for replace "http://" with "//"
I am wondering if there is a php code/command for the function.php file that will be say server to serve all image with HTTPS...?
I'm not an expert programmer, but I'm trying to find out logistics solutions.
Another thing, I wonder if the bug is doing some of the Osclass core files, so it can be fixed in the next update...
Cheers !