Photoshop CC 2019: I am suddenly getting a magenta cast (macOSX 10.13.6)

Did the change in printing coincide with an OS upgrade or a new version of Photoshop?
-Tom Attix

Yes.  Same day updated to 20.0.3 build.  Last OS update was probably 30 days prior.

Have you tried reinstalling the driver or deleting and creating a new instance of the printer in the OS prefs?

Alternately, have you tried reverting back to 20.0.2?

not even sure HOW to revert back....is there a "how to" article available?  I need to try that.

You'll need to delete the current 20.0.3, you can use the Uninstaller in /Applications/Adobe Photoshop CC 2019/Uninstall Adobe Photoshop CC 2019

Then go to the Creative Cloud app and click drop down arrow to the right of the open button:


Select Manage and then Other Versions:

This takes you to the download window:



Select the version you want to install.

Finally just deleted the Epson P800 printer and added it back from scratch.  Color cast gone.  Still using the 20.0.3 build.  Yowzah.......

Excellent.

Thanks for reporting the problem and I'm glad we could resolve it.
-Tom