Image OK in RGB -- Missing in CMYK

I have a PDF file that when I open in Photoshop in RGB the image appears correctly. When I open it as a CMYK part of a logo is missing. Any explanation?

In Photoshop with the CMYK open:
File: Place and browse to the original PDF. Hit enter.
Does it look OK now?

Similar Messages

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    Keep the document in color mode CMYK.
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