Hi i'm a little bit frustrated about this Model display color, i tried to change everything in the color option and also i reset my registry but still i does not fix my problem

If i open the model it shows the color or appearance that i specify but after editing one of its component it turns the entire assembly into dumb grey color. But if i will close and open again it will show the color i specified but after editing a component it will turn again the entire model into a Zombie color,

Dell Precision M6700 with Nvidia Quadro K5000M

This is also not large assembly it only contains 98 parts

Zombie color

The human color