After i chance in Configure/Setup
Plot Colors (Backround and Nodes)
or in 3D Viewer Setting
Backround Color (Top and Bottom to White)
and save it the Plot Colors not are changed .
What the matter ?

Changing the graphics configuration options only immediately affects jobs that have not been previously plotted.

For jobs that have been plotted before, you have two options to utilize new configuration settings.

1) From within the graphics, click on the icon for "Plot Configuration", then click on the [Reset] button.

2) Using Windows Explorer, navigate to the data directory and delete the XML file for the job in question.

When you exit the graphics, your current settings (including colors) are saved to an XML file for the job. This allows each job to have different view settings, based on model size, complexity, and what you're looking for.