**System Information**
windows 7 64bit gtx660
**Blender Version**
Broken: Blender 2.69, 4b206af?
**Short description of error**
Cycles transparent shader show different results if i use the same image but "duplicated" in the node editor.
**Exact steps for others to reproduce the error**
Based on a (as simple as possible) attached .blend file with minimum amount of steps
{F51223}
1 Image come from Gimp: the alpha channel was done from the "color to alpha" function, then exported as .png with default settings
2 Open the .blend provided (the image is packed inside)
3 Switch viewport shading to rendered
4 You will see two different results even if they should be the same.
5 The difference between "right"(plane at the left) and "wrong" is in the material node setup:
-right have the invert node input that come from another image texture node(alpha output), even if the texture/source is the same;
-wrong have the "usual" setup for transparent images.