B&W images turn black & red after edit in iPhoto '11 v. 9.3

After editing some B&W jpegs, which appear to edit properly, they appear red when next viewed. The thumbnails appear normal. Any edit appears to cause this: simple image rotation, quick Enhance, adjusting any slider. These images edited properly under the previous version.
This only happens with some downloaded jpegs, not with images from any of our cameras.
Emailed one of these jpegs to another mac, also updated to same new version, same result. Both macs (2011 Air and 2008 MBPro) running Lion.
Suggestions?
Frank

LarryHN,
Thanks. I can see that iPhoto does indeed only edit in RGB as you say, but as a developer and user interface designer for 40 years including a dozen years at Apple, it *is* a bug. The original image does have a valid color profile of grayscale when imported, so iPhoto should either handle the RGB conversion correctly or refuse to import the original image (or at least warn).
The current operation is what we used to refer to as "user hostile." The fact that this is causing my wife and I hours of distraction due to an invisible attribute is cause enough for identifying this as a bug. It is not possible to look at a grayscale image and know whether its profile is grayscale or RGB.
My wife also reports that this worked properly in the previous "dot" release, suggesing that this is a reversion, and thus a bug. I'll be contacting Apple support.
Again, thanks for you help. Much appreciated.
Frank

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