Simulink changes the block colors when running the simulation

I have a quite large model in Simulink. In some of the constant blocks I have written matrices. For some reason, when I run the simulation, the color of these matrix constant blocks changes to magenta. I have not defined colors for any of the blocks in my model, so I don't understand why only these blocks get a new color. After the blocks have become magenta, it is not possible to change the color back. Does anyone know how to prevent this from happening? I have tried to restart MATLAB and Simulink, but that doesn't seem to help. I am running MATLAB_R2015b.

[L Amy]

The color of the constant block represents its sample time. Here is a detailed documentation http://blogs.mathworks.com/simulink/2008/10/24/r2008b-simulink-sample-time-colors/

Answer 1

[Kiran]

Here is the documentation link that address this:

http://www.mathworks.com/help/simulink/ug/specifying-block-diagram-colors.html

Also, You can refer following discussion on MATLAB answers. http://in.mathworks.com/matlabcentral/answers/62158-change-simulink-block-colors-display-matlab-function