07002eec_ance_Calendar___PNG_that_works__Problem
[Solution] You’ve got PNG8 with alpha not supported by Photoshop. For editing, keep PNG in 24-bit, and convert to PNG8+alpha only when done. You can convert PNG8 to 24-bit by resaving it in Preview.app, Fireworks or with: pngout -s1 -c6 -force file.png [Problem] 
Photoshop displays transparency wrong
Performance Calendar » PNG that works
Problem