Sorry, I filed the bug too early.
It seems to be a bug/misbehaviour in ImageMagick. An inspection of the PNG file shows an 'oFFs' chunk with the (0,-2288) coordinates. I had taken the photographs rotated in a "portrait" orientation and had used the -rotate 270 option (or was it -90?) to 'convert' to properly re-orientate the images. I'm still not sure if I had viewed the images with the previous version of The Gimp, perhaps I hadn't.
Had support for the 'oFFs' chunk been recently added to the png plugin? Either way, it appears to be doing what it's supposed to be doing. You can close this bug now, sorry for wasting your time.
bye
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