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I no idea of the CaricoFoto you mention, I just use the Image manager to add an image to a custom block or just adding images to forum topics as I always have.
Never used anything to show images in a new window, all this has happened since the upgrade.
I just select an image from the Image Manager, select the image and and thats it, and the image I selected was 800 x 200 so I no idea what is happening in the Image Manager to reduce the image size