I've uploaded as attachments some images and the hue is shifted to the red or green from what I see prior to posting.
I'm doing experiment here with attached image followed by image hosted on imgur.
--ETA: The lower image is exact same file hosted at Imgur. Upper image is attachment, same file on AR15.com Media server uploaded through the "click to add media to post" reply box.
I think the color change is rather obvious, but if you're having problems seeing it, it made it yellow this time. I've seen the shading go to random colors, usually green or purple/red. This is the first yellow tinted one I've seen.
--ETA: @Goatboy Bug Confirmed, unless you're just messing with my account.
--ETA2: I think I found the problem. Testing - Uploading file from above a second time - Nope, that wasn't it. Canvas Fingerprinting on/off makes it less drastic, but doesn't fix it.