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July 4, 2016 at 11:58 #21684
Not a GIMP bug, just Train Fever being “unhappy” 😉 about the alpha channel, which GIMP and some other programs add to the image.
You can remove it in GIMP via the menu: Layers -> Transparency -> Remove Alpha Channel.
Photoshop Elements – to my best knowledge – does not support this feature and therefore strips it on loading and resaving.