In my factorio-current.log I find this:
62.731 Warning! Sprite at {0,0; 64x64} from __cargo-ships__/graphics/blank.png is defined with 4 mipmap levels, but level 1 is expected to be at {64,0; 32x32} which is out of bounds of the source image.
63.136 Warning! Sprite at {0,0; 64x64} from __cargo-ships__/graphics/icons/boat.png is defined with 4 mipmap levels, but level 1 is expected to be at {64,0; 32x32} which is out of bounds of the source image.
63.137 Warning! Sprite at {0,0; 128x128} from __cargo-ships__/graphics/icons/cargoship_icon.png is defined with 4 mipmap levels, but level 1 is expected to be at {128,0; 64x64} which is out of bounds of the source image.
63.138 Warning! Sprite at {0,0; 64x64} from __cargo-ships__/graphics/icons/ship-engine.png is defined with 4 mipmap levels, but level 1 is expected to be at {64,0; 32x32} which is out of bounds of the source image.
63.138 Warning! Sprite at {0,0; 128x128} from __cargo-ships__/graphics/icons/tanker.png is defined with 4 mipmap levels, but level 1 is expected to be at {128,0; 64x64} which is out of bounds of the source image.