Originally Posted by NiLuJe
That might still explain why the Calibre ones are not showing then, it's generating slightly smaller stuff that what the Kindle does/expect (which ends up meaning smaller stuff than what the PW expects, higher resolution and all), IIRC. Will have to check.
Nope, it's not the size. I've manually resized the original image to 216 px on the longest side matching Amazon's dimensions for the dictionary covers, and it still didn't take. Still no image.