sass compile results in css file with correct image paths, .min.css file incorrect

[onepartscissors]

i'm getting the following error when i try and minify a css file that's been created via a sass file. Only happening since updating to 2.1.3.

sass file:

.label_size_illustration {
  background-image: url(../images/graphic.jpg);
}

.css comes out 100% right:

.label_size_illustration {
  background-image: url(../images/graphic.jpg);
}

.min.css - add a weird extra specific path:

.label_size_illustration{background-image:url(../../../../../../../../../../Applications/Koala.app/Contents/Resources/images/graphic.jpg)}

I have tried compress and yui_compress, same path in the min.css.

config.rb:

Encoding.default_external = "utf-8"
require 'compass/import-once/activate'
css_dir = "css"
sass_dir = "sass"
images_dir = "images"
generated_images_dir = "images"
http_images_dir = "images"
http_images_path = "images"
javascripts_dir = "js"
output_style = :expanded
environment = :development
relative_assets = true
line_comments = false

I can remove all these from config.rb, same issue. i can comment out the image related lines, none of this changes anything.

[onepartscissors]

Thank you for the quick response, and a really awesome app! I love it! :-)