Color changing object in Repetier

While printing the printed object may be viewed in the manual control mode.
While movin g the cursor over the object, rthe color gets sometimes much darker.
I have no idea how to bring it back to the Original, lighter, color.

I’m not sure if this is the problem.

I have found on mine that if you are looking at the 3D view and it gets dark if you look in the log area that there may be a problem with the display adapter in your machine.
It been a long time since I have used this view and just leave it to monitor the temps.
But I think it said something about slowing the machine down or something like that.

When it happens check the log area in the software.