occasional magenta/green blotches

In this thread we started a discussion about  the " occasional magenta/green blotches I see in random files.". I post the link here to reach a larger base for finding solutions (or not?).

http://thecameraforum.com/discussions/still-imagery-group7/cameras-lenses-lighting-other-photo-gear-forum5/sigma-dp2-merrill-field-report-thread10.0/#postid-347

Is there a sure way (besides B&W :-)) to reduce the effect?

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Editor of Digital Outback Photo
http://www.outbackphoto.net/
Lightroom: http://www.outbackphoto.net/lightroom/