Why do my photos have a green tint when I upload them?

Sometimes when I resize images and upload them, the uploaded image has a greenish hue. I've noticed this happening when I edit them in Aperture (I usually just edit them in iPhoto because of this) and more recently with my new camera. I recently got rid of my old Canon T3 which didn't seem to have this problem. Now I have a Nikon D5100 and it seems like this is happening all the time. When I upload images to Blogger, the images have a green tint in smaller sizes, but when I make them larger, the problem goes away. Uploaded to foodgawker.com, I can't find any way to get rid of the problem. I've tried using Safari instead of Firefox and I've also tried assigning different color profiles (adobeRGB, sRGB, etc.). I'm out of ideas, so any suggestions would be awesome.

P.S. Here's an example of what I'm talking about:
The photo on the left is the uploaded photo, the photo on the right is the original.
>>> Why do my photos have a green tint when I upload them?