Really strange! I get the same behavior. I thought it was maybe Chrome vs my image viewer, but if I open the downloaded image with Chrome, it's just pure red, but the preview in Dropbox I definitely (faintly) see the logo.
If I right click and save the dropbox preview, I get a 14kb image, but the downloaded image is 29kb. As far as I can tell they're both PNGs with the same bit depth.
If I right click and save the dropbox preview, I get a 14kb image, but the downloaded image is 29kb. As far as I can tell they're both PNGs with the same bit depth.