Top screen / sub screen display settings don't work when they should

[stripes-8]

The top screen and sub screen display settings only take effect when the settings menu is closed, but not when assigned to a button combination shortcut.
Also, if the display setting is set to 'sub screen' when a game is loaded with NesDS using arguments, (or when using TWiLightMenu++,) the game will still be displayed on the top screen by default, and the setting won't take effect until the settings menu is opened and closed.

Maybe the display screen should update whenever it doesn't match the display setting outside of the settings menu? I want to try to fix this my self, but I can't seem to compile the source code.