Explicitly setting a clock text size, instead of leaving it at default, causes the correct color to display.
By the way, a "Restart" command on the right-click menu for the DF tray icon would come in handy when trying out settings that don't take effect until DF has been restarted.
We've released a new beta that adds the restart feature to the tray icon menu, along with the troubleshooting tab in the Settings window. You can grab the beta here: https://www.displayfusion.com/Download/Beta/