A group of Microsoft Products and technologies used for sharing and managing content, knowledge, and applications.
That doesn't really help, except to prove it's a common problem as I said. It's obviously not a problem with EXIF data because the images appear correctly everywhere except in the web part. And I don't see this issue on any other platform so it's clearly a SP problem. I can't ask users to edit their images or save them as pngs, and if I have to do it, Msft will have to pay for my time, since it's their flawed functionality causing the issue.