I have both CC 2018 and CC 2019 and the 'Color' blending mode works correctly in CC 2018 but not in CC 2019.
It is as you say. Blending red or cyan does create grey and other colours create weird colours in the 'Color' blending mode.
What I tried so far:
- uninstall video drivers with DDU;
- reset PS preferences;
- uninstall PS and clean everything with the Adobe Creative Cloud Cleaner Tool.
It happens with or without GPU enabled.
Using the "Legacy Compositing" solves this immediately.
I'm on Windows 10 1803 (build SO 17134.345), Intel i7 4770, ASUS Strix GTX 1080 with latest nVidia drivers (416.34).
Hope this helps to understand what the problem is.
As recommended above, checking the "Legacy Compositing" option is the best workaround for the time being.
We are happy to announce the release of Photoshop CC 20.0.1
This update includes fixes to some of the top customer reported issues among other bug fixes.
To update Photoshop CC to 20.0.1, click "Update" in the Creative Cloud desktop app next to Photoshop CC. More detailed instructions for updating