I just recently started working on a MAC (have been a PC user for years) and I have never had this problem with the DPI/PPI. Not sure if it may be a Mac issue, a CC issue or user error on my part.
I create an image in photoshop ie 1900x600 300PPI, no resampling. I import into Illustrator to the same size 1900x600 and the image is about 1/4 the size of the board. So I go back into photoshop and change the PPI to 1200PPI with the same result. The only way to get the image the save size it to quadrupule the size of the image in terms of pixels. This seems rediculous to me and there must be an easier/more logical way of doing this. i never had this issue on any of my other computers where I have a physical copy of the master collection which makes me think this could posisbly be a CC issue.
Any thoughts?