Problem Converting to CMYK

I have been using Photoshop for several years and have never, ever had this issue come up. In fact, I'm sure it's just something I did on accident in some kind of settings and can't find again. When I attempt to convert any other type (rgb, grayscale, index, etc) to cmyk the image disappears. If I drag or copy an image from an rgb to a cmyk I have open it shows up as a white square. I'm sure someone out there has had this problem before, it seems so strange and accidental. If anyone can help me out on finding what it is I clicked and didn't mean to that would be awesome.
Ash

You don't include much detail, but if you are using Image > Mode to change to CMYK, it will pick up the default CMYK profile specified in Color Settings. If it's not a legitimate CMYK profile, then may be the cause of your problem.
If it's not this simple, more info as to your system, configuration, settings, etc. might help.
Richard Southworth

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