Oops. We started setting the theme's expected coordinate space

in Screen, by calling SetFOV to make ActorFrame do LoadMenuPerspective.
That broke screen backgrounds, which are rendered outside of any
screen, so they always used 640x480 (the default).

stepmania/src/ScreenManager.cpp

@@ -71,6 +71,7 @@
 #include "RageTextureManager.h"
 #include "ThemeManager.h"
 #include "Screen.h"
+#include "ScreenDimensions.h"
 #include "Foreach.h"
 #include "ActorUtil.h"
 #include "GameLoop.h"
@@ -419,7 +420,10 @@ void ScreenManager::Draw()
 	if( !DISPLAY->BeginFrame() )
 		return;
 
+	DISPLAY->CameraPushMatrix();
+	DISPLAY->LoadMenuPerspective( 0, SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_CENTER_X, SCREEN_CENTER_Y );
 	g_pSharedBGA->Draw();
+	DISPLAY->CameraPopMatrix();
 
 	for( unsigned i=0; i<g_ScreenStack.size(); i++ )	// Draw all screens bottom to top
 		g_ScreenStack[i].m_pScreen->Draw();