Gerber OMEGA CP Reference Manual page 67

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Note: If you have the OMEGA Monument option, the default Monument settings are loaded
on start up. When Use Default Monument Settings on Start is turned on (on the General tab)
the default vinyl palette is 220 – GA3.5. You can change the Default Vinyl Color and the
Default Background Color, but you must choose a color within this palette. If you attempt to
change the Default Palette, OMEGA automatically returns to the Monument settings, even if
you click Preference.