We have a Robotics solution that utilizes an Application Bar. Recently, we have a reported instance of the background color (of the Appbar) changing when the user locks/unlocks their machine. Investigating has revealed the User has the Background color of the machine set to black, but the appbar issue is a recent issue. The Appbar is set to the color: "Control", but when the machine is locked/unlocked it will change to black.
Runtime log has not produced anything out of the ordinary
We noticed changing the background color of the machine to a different color and then switch it back to black will change the Appbar back to "Control" color. I'm thinking it might be a machine specific setting but unsure on the actual root cause.