This was discovered while evaluating JDK-8154847. See that bug for more information.

To reproduce this, do the following on a Windows 10 system:

1. Open the Personalize Setting app

2. Select the "Colors" tab

3. Choose a color other than the default

4. Select the check box to show the accent color on "Title bars and window borders"

5. Run the attached test program

BUG: the old color prior to making the change will be used.

If you change the color again, either while the app is running or between two invocations of the app, it will still not pick up the new color.

If I log out and log back in Windows it will pick up the last color that was set.