diff --git a/ETL/ETL/_pen.h b/ETL/ETL/_pen.h
index 13913be..6c551b4 100644
--- a/ETL/ETL/_pen.h
+++ b/ETL/ETL/_pen.h
@@ -108,8 +108,8 @@ public:
 	operator bool()const { return (bool)data_; }
 	bool operator!()const { return !data_; }
 
-	generic_pen_row_iterator(pointer data, int pitch):data_(data),pitch_(pitch) { }
-	generic_pen_row_iterator():data_(NULL) { }
+	generic_pen_row_iterator(pointer data, int pitch):data_(data), pitch_(pitch) { }
+	generic_pen_row_iterator():data_(NULL), pitch_(0) { }
 };
 
 template<typename T, typename AT=T>
diff --git a/synfig-core/src/synfig/renddesc.h b/synfig-core/src/synfig/renddesc.h
index 7b557ce..d42f482 100644
--- a/synfig-core/src/synfig/renddesc.h
+++ b/synfig-core/src/synfig/renddesc.h
@@ -146,7 +146,11 @@ public:
 		time_begin	(0),
 		time_end	(0),
 		outline_grow(0),
-		AntialiasFilter(ANTIALIAS_UNIFORM)
+		AntialiasFilter(ANTIALIAS_UNIFORM),
+		w_ratio_(1), 
+		h_ratio_(1), 
+		x_res_ratio_(1), 
+		y_res_ratio_(1)
 	{ }
 
 	static RendDesc zero()
@@ -386,6 +390,7 @@ inline RendDesc::Lock operator|(RendDesc::Lock lhs, RendDesc::Lock rhs)
 /*!	\see RendDesc::Lock, RendDesc */
 inline RendDesc::Lock operator&(RendDesc::Lock lhs, RendDesc::Lock rhs)
 {
+	#warning V1016 The value '~(int) rhs' is out of range of enum values. This causes unspecified or undefined behavior.
 	return static_cast<RendDesc::Lock>((int)lhs&(int)rhs);
 }
 
diff --git a/synfig-studio/src/gui/docks/dock_timetrack.cpp b/synfig-studio/src/gui/docks/dock_timetrack.cpp
index 4458242..63e2691 100644
--- a/synfig-studio/src/gui/docks/dock_timetrack.cpp
+++ b/synfig-studio/src/gui/docks/dock_timetrack.cpp
@@ -409,6 +409,7 @@ public:
 Dock_Timetrack::Dock_Timetrack():
 	Dock_CanvasSpecific("timetrack",_("Timetrack"),Gtk::StockID("synfig-timetrack"))
 {
+	mimic_tree_view = NULL;
 	table_=0;
 	widget_timeslider_= new Widget_Timeslider();
 	widget_kf_list_= new Widget_Keyframe_List();
diff --git a/synfig-studio/src/gui/preview.cpp b/synfig-studio/src/gui/preview.cpp
index d2e5b52..0be321e 100644
--- a/synfig-studio/src/gui/preview.cpp
+++ b/synfig-studio/src/gui/preview.cpp
@@ -165,7 +165,8 @@ studio::Preview::Preview(const etl::loose_handle<CanvasView> &h, float zoom, flo
 	overbegin(false),
 	overend(false),
 	quality(),
-	global_fps()
+	global_fps(),
+	jack_offset(0.f)
 { }
 
 void studio::Preview::set_canvasview(const etl::loose_handle<CanvasView> &h)
diff --git a/synfig-studio/src/gui/states/state_normal.cpp b/synfig-studio/src/gui/states/state_normal.cpp
index 36da1ef..f737098 100644
--- a/synfig-studio/src/gui/states/state_normal.cpp
+++ b/synfig-studio/src/gui/states/state_normal.cpp
@@ -337,6 +337,7 @@ StateNormal_Context::~StateNormal_Context()
 
 DuckDrag_Combo::DuckDrag_Combo():
 	original_mag(),
+	original_angle(),
 	bad_drag(),
 	move_only(),
 	is_moving(false),
diff --git a/synfig-studio/src/gui/states/state_rotate.cpp b/synfig-studio/src/gui/states/state_rotate.cpp
index d09f7da..6461bee 100644
--- a/synfig-studio/src/gui/states/state_rotate.cpp
+++ b/synfig-studio/src/gui/states/state_rotate.cpp
@@ -264,6 +264,7 @@ StateRotate_Context::~StateRotate_Context()
 
 DuckDrag_Rotate::DuckDrag_Rotate():
 	original_mag(),
+	original_angle(),
 	bad_drag(),
 	move_only(),
 	use_magnitude(true)
diff --git a/synfig-studio/src/gui/widgets/widget_gradient.cpp b/synfig-studio/src/gui/widgets/widget_gradient.cpp
index 42ee31f..ef6fe95 100644
--- a/synfig-studio/src/gui/widgets/widget_gradient.cpp
+++ b/synfig-studio/src/gui/widgets/widget_gradient.cpp
@@ -100,7 +100,8 @@ studio::render_gradient_to_window(const Cairo::RefPtr<Cairo::Context>& cr,const 
 /* === M E T H O D S ======================================================= */
 
 Widget_Gradient::Widget_Gradient():
-	editable_(false)
+	editable_(false),
+	changed_(false)
 {
 	set_size_request(-1,64);
 	add_events(Gdk::BUTTON_PRESS_MASK | Gdk::BUTTON_RELEASE_MASK);