missed a piece

stepmania/src/RageDisplay.cpp

@@ -604,6 +604,12 @@ RageMatrix RageDisplay::GetFrustumMatrix( float l, float r, float b, float t, fl
 	return m;
 }
 
+void RageDisplay::ResolutionChanged()
+{
+	/* The centering matrix depends on the resolution. */
+	UpdateCentering();
+}
+
 void RageDisplay::ChangeCentering( int iTranslateX, int iTranslateY, int iAddWidth, int iAddHeight )
 {
 	g_iTranslateX = iTranslateX;

stepmania/src/RageDisplay.h

@@ -144,7 +144,7 @@ public:
 	CString SetVideoMode( VideoModeParams p, bool &bNeedReloadTextures );
 
 	/* Call this when the resolution has been changed externally: */
-	virtual void ResolutionChanged() { }
+	virtual void ResolutionChanged();
 
 	virtual bool BeginFrame() = 0;	
 	virtual void EndFrame();