[Printing colour- red cast]

Any colour image I open and then try to print, shows (and prints) with a heavy red cast. This is even before I make, or even open, any adjustments at all. Black and white images are fine.

The printer, a Canon 100S, will print these same images perfectly well direct from the computer if I export to that first.

I have the latest version (1.7.2) and use an iMac with the latest OS (10.14.5)