Glad you got it solved.Thanks for the help on this.
I think I've tracked down the problem. The color profile for this one image is ProPhoto RGB. It seems from reading the wiki on it that it supports a wider gamut than the typical sRGB. When I convert the color space profile from ProPhoto RGB to sRBG IEC61966-2.1 in Photoshop, it loads into C3d properly.
Cheers
Frank