Unity3D in 3.4 version there is a bug Texture2D to save PNG file on Android platform.

In Unity3D 3.5, this bus was fixed.

Fixes
Android
Texture2D.EncodeToPNG() / Application.CaptureScreenshot() produced broken images.

In 3.4 I used JPGEncoder instead of Texture2D.EncodeToPNG().
Original JPGEncoder with javascript is here
And with C# version are here(thread) and here(zip file)

Now, I'll try JPGEncoder with C#.