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You're not doing anything wrong. You have your colorspace set to AdobeRGB. The leading underscore in the filename indicates this. If you're shooting in raw, change your colorspace back to sRGB to get your first character back. Raw processing doesn't care about the color space setting in the camera, and if you're shooting jpegs, you're better off shooting sRGB so your jpeg colorspace doesn't have to be changed later.
Wow, many thanks. I didn't notice this in the manual, or skipped over it in the color space section.