There seems to be a bug in the latest experimental where the built in color picker to set OP colors always provides the same result (magenta.) The None button functions correctly.
I’ll note that setting with python does still work: op('grid1').color = [1,1,1]
I’d like to add, that the color of previously colored OPs have also changed, everything has gotten darker.
For example a COMP that was colored red before had the values: (0.52, 0.09, 0.09), and now they’re (0.42, 0.07, 0.08). As an example an OP that was colored not through the picker menu but through the .color attribute: (1, 0.56, 0.04) → (0.82, 0.46, 0.04)
The operator colour-coding palette thing in the bottom right (called when pressing “c”) allows you to pick any colour you’d like to colour-code your operators with… as long as that colour is burgundy!