Edit in Photoshop and Alpha Channel

When I open an image in Photoshop using 'Open with External Editor', and add an alpha channel, when I save it back to Aperture the alpha mask shows on top of the image, whether or not it is made visible in Photoshop. Furthermore, the thumbnail shows the mask as white and the image shows the mask as black.
Are others seeing this same behavior? Do I have a setting that is incorrect?

Search the discussions on a couple of these terms -- there was a thread or two a couple of months ago.
It turns out (I can't remember who pointe this out! sorry!) that if you put a completely blank alpha channel at the top of the stack of them (that is, under the R, G and B channels in the Channels palette), then save, the image shows up OK.

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