I use Illustrator on an iMac. With the upgrade to CC 2018, the following happened:
1) In the Layers Palette, all layers colored Cyan changed to Yellow;
2) All layers colored Magenta changed to Cyan.

By itself, this is not a terrible problem (disregarding Yellow as a terrible layer color to begin with!) The problem comes when I try to change them back.

When I open the Layer Options for a particular layer, I used to hit 'Tab' to take me to the Color, then 'C' to get Cyan. Now, it brings up a Custom window that I have to click to close, before typing 'C' and getting Cyan.

Specific colors are required for specific layers where I work, to leaving them in their changed state is not an option.

Please fix this, please.