So color styles can be added to MoI, and are lost upon re-opening MoI, unless the MoI screen is saved as a .3dm file to the Moi "Template file" in AppData/roaming/Moi.
The current Template file location is shown in Options/General (?)

Saving Gradient colored objects to a .3dm file, in some other place, preserves their color style in the .3dm file.
Upon re-loading to MoI, the Gradient colors are added back to MoI's style menu, but not necessarily permanently.

- Brian