Your plugin seems to be exactly what I'm looking for... The only problem is, I can't seem to make the images load. The @2x files are being generated, but they're not showing up when I load the page.
I've tried adding the RewriteRule in the FAQ to my .htaccess file, but it didn't seem to help.
I'm wondering if it has something to do with my uploads being located in a directory other than the wordpress default directory.
Here are 4 screenshots of my setting panels incase there is something obvious that I'm missing. Only pay attention to the file "why-support.jpg". It's the only one I've been working with using your plugin.
The page that I'm trying to load the image on is: http://dotwong.com/test/tip/why-support/
Thanks a lot for your help. I am really looking forward to using this plugin!