Submissions: Color Warp in Lot Preview Images

I don't know what's gotten into the submission system, but it coughs and sputters every time I feed it a preview image. On some browsers it returns an image with a bright, icky green hue. On other browsers, it shows a negative color image. And sometimes it doesn't show at all.

I assure you that nothing is wrong with the colors in my lots. They are normal. Below is a comparison of the TSR preview image (left) and the original image (right).