I have had a set of P2 Carbon cartridges in my 4800 for a couple of months now, and all was going well. I ran a test print a couple of weeks back to keep the heads clean and it looked good.
Over the weekend I went up two versions of OSX to Mojave 10.14.3. I ran a print tonight and it looks downright scary. After studying it, it appears that all of the midtones are a single shade. There are dark shadows and bright highlights, but lots of monochromatic grey in between.
I use Print Tool with no color management, and the 21 step Spyder target looks good (I think). I have also reinstalled QTR and Community Edition (post-upgrade).
I’m stumped and frustrated. I hope someone can help out here. My sample image is below, or can be viewed at Four Terriers.