diff --git a/src/emucore/tia/Ball.hxx b/src/emucore/tia/Ball.hxx
index 9923bf7ab..654f08b06 100644
--- a/src/emucore/tia/Ball.hxx
+++ b/src/emucore/tia/Ball.hxx
@@ -96,7 +96,7 @@ class Ball : public Serializable
       }
     }
 
-    void tick(bool isReceivingMclock = false)
+    void tick(bool isReceivingMclock = true)
     {
       if(myUseInvertedPhaseClock && myInvertedPhaseClock)
       {
diff --git a/src/emucore/tia/Missile.hxx b/src/emucore/tia/Missile.hxx
index 80f16a5b6..2cfc0408b 100644
--- a/src/emucore/tia/Missile.hxx
+++ b/src/emucore/tia/Missile.hxx
@@ -87,7 +87,7 @@ class Missile : public Serializable
       }
     }
 
-    void tick(uInt8 hclock, bool isReceivingMclock = false)
+    void tick(uInt8 hclock, bool isReceivingMclock = true)
     {
       if(myUseInvertedPhaseClock && myInvertedPhaseClock)
       {
diff --git a/src/gui/ListWidget.cxx b/src/gui/ListWidget.cxx
index f7fd609b2..f6fb6cd26 100644
--- a/src/gui/ListWidget.cxx
+++ b/src/gui/ListWidget.cxx
@@ -366,12 +366,14 @@ bool ListWidget::handleEvent(Event::Type e)
       break;
 
     case Event::UIPgUp:
+    case Event::UILeft:
       _selectedItem -= _rows - 1;
       if (_selectedItem < 0)
         _selectedItem = 0;
       break;
 
     case Event::UIPgDown:
+    case Event::UIRight:
       _selectedItem += _rows - 1;
       if (_selectedItem >= size)
         _selectedItem = size - 1;