I am creating a poster in Illustrator. I had a linked .png file that I had converted to black and white to use as a raster texture effect over my vector artwork. I accidentally had set my color mode to RGB when I created the file, so I converted to cmyk. When I had exported to RGB previous to this, everything exported fine. However, when I converted to cmyk, and I tried exporting, the raster image was missing upon export. I searched the web and tried saving the image as a TIFF & relinking, then as a PSD file and relinking, then embedding the file, and checking overprint preview. I tried all of this and the graphic is still missing upon exporting to JPEG. Help! Is this a bug, or am I missing something major?!