Steve,

It would appear from the gif you sent that the green and blue values are reversed and that the red and alpha values are reversed. To double-check this, 

- get a RectangleMorph from the new morph menu
- open an Inspector on it
- in the inspector, 
--- evaluate (self color: Color green). What happens?
--- evaluate (self color: Color red). What happens?
--- evaluate (self color: Color blue). What happens?

The results may point to the byte-ordering of color values not being correctly mapped to your display's color space.

Cheers,
Bob