I'm wondering if anyone has come across this yet. I think it's a new issue with GMail. We have a brand color of #e20074 for TMobile. When the gif is opened in Gmail the color in the cached image is shifted to #e70073. This is really bad for branding. I can fix this logo by saving it as a PNG but we often have animated gifs that bleed into the magenta in other cell and they won't match now.