Excuse the poor image quality. There is a green icon on the top right hand side of the document. When it's alone on the page the icon appears as it is meant to appear: R 69 G 255 B 0.
As soon as any other image is placed on the screen, the green icon gets much duller. Why is this?
The transparency blend space is set to RGB. Everything is being exported as the high quality preset PDF.
Thanks for the help.
It looks like the view is switching to Overprint Preview, but I'm not sure why adding another image would force that.
Indeed the color is out of gamut, but as Peter noted, I cannot (with 2 minutes trying) force ID to switch to Overprint Preview simply by placing a graphic.