Photoshop won't print in color in right orientation

I'm having the strangest issue with Photoshop.
I've made a get well card for a colleague (we both work in theater), and I'm trying to print it (A6 format).
As soon as I select the right orientation, Photoshop shows a black/white preview of it. 
(And when I print it, I get a black/white version). If I select portrait mode (which messes up the card of course), it shows it in color. 

I've even tried changing it by just rotating the image, to allow it to be printed in portrait mode. But then the same problem arises: suddenly portrait mode shows black/white and landscape mode (cutting it and f*cking up the card again) shows it in color.

Same issue if I select: "Photoshop manages color", by the way.
I have absolutely no idea how to fix this. It's the weirdest thing.
Anyone have any tips?