to complete the bugreport: if you just drag and drop the png, you can 
see the wrong result.

Bernd Eckardt

Interlaced png-images opened in Squeak are displayed incorrectly. You 
just can see a grid of the image with transparent spaces. Saving a PNG 
out of Corel-Photopaint (standard) or  Photoshop (optional as 
interlaced) leads to this effect.
Seems to be a little bug inside the PNGReadWriter class.  
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