Logo and background images on login cause mixed content for SSL

Hey
I am running a https across all of my site. I edited the wp-config to force ssl for login rego etc and admin.

The background image and custom logo I am using with your plugin is causing mixed content (So I am not getting green padlock). This is because your plugin pulls the images from the media library as http not https. For example,my custom logo appears in css of the login page as:

 #login h1 a {
    background-image: url("https://MySite.com/wp-content/uploads/Site-Logo.png");

Please let me know if you have a fix for this problem.

Thanks in advance for your assistance.

Kind Regards

Max