HTTPS Mixed Content Warning with Compass Theme

We have Compass installed on a website we just updated to https and the site is returning Mixed Content browser warnings because images in the /uploads/ directory are still being loaded via http. Does this theme use absolute URL’s to load images that could be causing images to load via http? How can we fix this error?

I have searched many of the theme files, but have not been able to locate any absolute URL’s to update in the css, functions, etc. files.