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Apple has released new version of iTunes Connect & I got an error message when I tried to set Screenshots on itunes connect for my app.
"Images can't contain alpha channels or transparencies." 
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Alpha channel. An alpha channel, representing transparency information on a per-pixel basis, can be included in grayscale and truecolor PNG images. An alpha value of zero represents full transparency, and a value of (2^bitdepth)-1 represents a fully opaque pixel.
Not All Formats Have an Alpha Channel The TIFF, PNG and WebP graphics formats support the 8-bit alpha channel, whereas JPEGs have none.
The original JPEG format doesn't provide for an alpha channel. You can make a PNG file, however. It will work in IE7+ and other "modern" browsers. The "JPEG 2000" format does support transparency, but despite the name it's really a completely new image encoding format.
The alpha channel is a special channel that handles transparency. When an image has an alpha channel on it, it means you can adjust the image's opacity levels and make bits translucent or totally see-through. The alpha channel is instrumental when you want to remove the background from an image.
I've found you can also just re-export the png's in Preview, but uncheck the Alpha checkbox when saving.
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AFAIK png with transparency is not allowed. use jpg OR update your png (photoshop or whatever you using to create the png) and delete the transparency areas. if you work with shadows, use jpg, that will do no headaches.
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