Items are not recached until GAL is changed (earlier it was done on every rendering backend switch).

common/drawpanel_gal.cpp

@@ -134,6 +134,9 @@ void EDA_DRAW_PANEL_GAL::Refresh( bool eraseBackground, const wxRect* rect )
 
 void EDA_DRAW_PANEL_GAL::SwitchBackend( GalType aGalType, bool aUseShaders )
 {
+    if( aGalType == m_currentGal && m_gal != NULL )
+        return;
+
     if( m_gal )
         delete m_gal;
 
@@ -164,4 +167,6 @@ void EDA_DRAW_PANEL_GAL::SwitchBackend( GalType aGalType, bool aUseShaders )
 
     wxSize size = GetClientSize();
     m_gal->ResizeScreen( size.GetX(), size.GetY() );
+
+    m_currentGal = aGalType;
 }

include/class_drawpanel_gal.h

@@ -87,6 +87,7 @@ protected:
     KiGfx::PAINTER*          m_painter;          ///< Contains information about how to draw items
                                                  ///< using GAL
     KiGfx::WX_VIEW_CONTROLS* m_viewControls;     ///< Control for VIEW (moving, zooming, etc.)
+    GalType                  m_currentGal;       ///< Currently used GAL
 
     std::string              m_galShaderPath;    ///< Path to shader files, used in OpenGL mode
 };