diff --git a/Generals/Code/Libraries/Source/WWVegas/WW3D2/animobj.cpp b/Generals/Code/Libraries/Source/WWVegas/WW3D2/animobj.cpp
index 4cf15ff8292..d2b16477fd5 100644
--- a/Generals/Code/Libraries/Source/WWVegas/WW3D2/animobj.cpp
+++ b/Generals/Code/Libraries/Source/WWVegas/WW3D2/animobj.cpp
@@ -286,7 +286,12 @@ void Animatable3DObjClass::Render(RenderInfoClass & rinfo)
 		return;
 	}
 
-	if (!Is_Hierarchy_Valid() || Are_Sub_Object_Transforms_Dirty()) {
+	//
+	// Force the hierarchy to be recalculated for single animations.
+	//
+	const bool isSingleAnim = CurMotionMode == SINGLE_ANIM && ModeAnim.AnimMode != ANIM_MODE_MANUAL;
+
+	if (isSingleAnim || !Is_Hierarchy_Valid() || Are_Sub_Object_Transforms_Dirty()) {
 		Update_Sub_Object_Transforms();
 	}
 }
@@ -307,7 +312,12 @@ void Animatable3DObjClass::Special_Render(SpecialRenderInfoClass & rinfo)
 {
 	if (HTree == NULL) return;
 
-	if (!Is_Hierarchy_Valid()) {
+	//
+	// Force the hierarchy to be recalculated for single animations.
+	//
+	const bool isSingleAnim = CurMotionMode == SINGLE_ANIM && ModeAnim.AnimMode != ANIM_MODE_MANUAL;
+
+	if (isSingleAnim || !Is_Hierarchy_Valid()) {
 		Update_Sub_Object_Transforms();
 	}
 }
@@ -805,7 +815,7 @@ void Animatable3DObjClass::Update_Sub_Object_Transforms(void)
 				ModeInterp.PrevFrame1 = AnimatedSoundMgrClass::Trigger_Sound(ModeInterp.Motion1, ModeInterp.PrevFrame1, ModeInterp.Frame1, HTree->Get_Transform(ModeInterp.Motion1->Get_Embedded_Sound_Bone_Index()));
 			}
 
-  			break;
+			break;
 
 		case MULTIPLE_ANIM:
 		{
@@ -1025,19 +1035,13 @@ void Animatable3DObjClass::Single_Anim_Progress (void)
 	//
 	//	Update the current frame (only works in "SINGLE_ANIM" mode!)
 	//
-	if (CurMotionMode == SINGLE_ANIM) {
+	WWASSERT(CurMotionMode == SINGLE_ANIM);
 
-		//
-		// Update the frame number and sync time
-		//
-		ModeAnim.PrevFrame		= ModeAnim.Frame;
-		ModeAnim.Frame				= Compute_Current_Frame(&ModeAnim.animDirection);
-
-		//
-		// Force the hierarchy to be recalculated
-		//
-		Set_Hierarchy_Valid (false);
-	}
+	//
+	// Update the frame number and sync time
+	//
+	ModeAnim.PrevFrame		= ModeAnim.Frame;
+	ModeAnim.Frame				= Compute_Current_Frame(&ModeAnim.animDirection);
 }
 
 
diff --git a/Generals/Code/Libraries/Source/WWVegas/WW3D2/animobj.h b/Generals/Code/Libraries/Source/WWVegas/WW3D2/animobj.h
index b93b1bc775b..99e14f61aa5 100644
--- a/Generals/Code/Libraries/Source/WWVegas/WW3D2/animobj.h
+++ b/Generals/Code/Libraries/Source/WWVegas/WW3D2/animobj.h
@@ -113,7 +113,7 @@ class Animatable3DObjClass : public CompositeRenderObjClass
 
 	//
 	//	Simple bone evaluation methods for when the caller doesn't want
-	// to update the heirarchy, but needs to know the transform of
+	// to update the hierarchy, but needs to know the transform of
 	// a bone at a given frame.
 	//
 	virtual bool					Simple_Evaluate_Bone(int boneindex, Matrix3D *tm) const;
@@ -153,14 +153,14 @@ class Animatable3DObjClass : public CompositeRenderObjClass
 	void								Combo_Update(	const Matrix3D & root,
 															HAnimComboClass *anim);
 
-	// flag to kep track of whether the hierarchy tree transforms are currently valid
+	// flag to keep track of whether the hierarchy tree transforms are currently valid
 	bool								Is_Hierarchy_Valid(void) const				{ return IsTreeValid; }
 	void								Set_Hierarchy_Valid(bool onoff) const  	{ IsTreeValid = onoff; }
 
-	// Progress anims for single anim (loop and once)
+	// Progress animations for single anim (loop and once)
 	void								Single_Anim_Progress( void );
 
-	// Release any anims
+	// Release any animations
 	void								Release( void );
 
 protected:
diff --git a/GeneralsMD/Code/Libraries/Source/WWVegas/WW3D2/animobj.cpp b/GeneralsMD/Code/Libraries/Source/WWVegas/WW3D2/animobj.cpp
index 15e089a0bab..1c5d4483a40 100644
--- a/GeneralsMD/Code/Libraries/Source/WWVegas/WW3D2/animobj.cpp
+++ b/GeneralsMD/Code/Libraries/Source/WWVegas/WW3D2/animobj.cpp
@@ -286,7 +286,12 @@ void Animatable3DObjClass::Render(RenderInfoClass & rinfo)
 		return;
 	}
 
-	if (!Is_Hierarchy_Valid() || Are_Sub_Object_Transforms_Dirty()) {
+	//
+	// Force the hierarchy to be recalculated for single animations.
+	//
+	const bool isSingleAnim = CurMotionMode == SINGLE_ANIM && ModeAnim.AnimMode != ANIM_MODE_MANUAL;
+
+	if (isSingleAnim || !Is_Hierarchy_Valid() || Are_Sub_Object_Transforms_Dirty()) {
 		Update_Sub_Object_Transforms();
 	}
 }
@@ -307,7 +312,12 @@ void Animatable3DObjClass::Special_Render(SpecialRenderInfoClass & rinfo)
 {
 	if (HTree == NULL) return;
 
-	if (!Is_Hierarchy_Valid()) {
+	//
+	// Force the hierarchy to be recalculated for single animations.
+	//
+	const bool isSingleAnim = CurMotionMode == SINGLE_ANIM && ModeAnim.AnimMode != ANIM_MODE_MANUAL;
+
+	if (isSingleAnim || !Is_Hierarchy_Valid()) {
 		Update_Sub_Object_Transforms();
 	}
 }
@@ -804,7 +814,7 @@ void Animatable3DObjClass::Update_Sub_Object_Transforms(void)
 				ModeInterp.PrevFrame1 = AnimatedSoundMgrClass::Trigger_Sound(ModeInterp.Motion1, ModeInterp.PrevFrame1, ModeInterp.Frame1, HTree->Get_Transform(ModeInterp.Motion1->Get_Embedded_Sound_Bone_Index()));
 			}
 
-  			break;
+			break;
 
 		case MULTIPLE_ANIM:
 		{
@@ -1033,19 +1043,13 @@ void Animatable3DObjClass::Single_Anim_Progress (void)
 	//
 	//	Update the current frame (only works in "SINGLE_ANIM" mode!)
 	//
-	if (CurMotionMode == SINGLE_ANIM) {
+	WWASSERT(CurMotionMode == SINGLE_ANIM);
 
-		//
-		// Update the frame number and sync time
-		//
-		ModeAnim.PrevFrame		= ModeAnim.Frame;
-		ModeAnim.Frame				= Compute_Current_Frame(&ModeAnim.animDirection);
-
-		//
-		// Force the hierarchy to be recalculated
-		//
-		Set_Hierarchy_Valid (false);
-	}
+	//
+	// Update the frame number and sync time
+	//
+	ModeAnim.PrevFrame		= ModeAnim.Frame;
+	ModeAnim.Frame				= Compute_Current_Frame(&ModeAnim.animDirection);
 }
 
 
diff --git a/GeneralsMD/Code/Libraries/Source/WWVegas/WW3D2/animobj.h b/GeneralsMD/Code/Libraries/Source/WWVegas/WW3D2/animobj.h
index 437480caf16..5f0aa7c8d6e 100644
--- a/GeneralsMD/Code/Libraries/Source/WWVegas/WW3D2/animobj.h
+++ b/GeneralsMD/Code/Libraries/Source/WWVegas/WW3D2/animobj.h
@@ -113,7 +113,7 @@ class Animatable3DObjClass : public CompositeRenderObjClass
 
 	//
 	//	Simple bone evaluation methods for when the caller doesn't want
-	// to update the heirarchy, but needs to know the transform of
+	// to update the hierarchy, but needs to know the transform of
 	// a bone at a given frame.
 	//
 	virtual bool					Simple_Evaluate_Bone(int boneindex, Matrix3D *tm) const;
@@ -153,14 +153,14 @@ class Animatable3DObjClass : public CompositeRenderObjClass
 	void								Combo_Update(	const Matrix3D & root,
 															HAnimComboClass *anim);
 
-	// flag to kep track of whether the hierarchy tree transforms are currently valid
+	// flag to keep track of whether the hierarchy tree transforms are currently valid
 	bool								Is_Hierarchy_Valid(void) const				{ return IsTreeValid; }
 	void								Set_Hierarchy_Valid(bool onoff) const  	{ IsTreeValid = onoff; }
 
-	// Progress anims for single anim (loop and once)
+	// Progress animations for single anim (loop and once)
 	void								Single_Anim_Progress( void );
 
-	// Release any anims
+	// Release any animations
 	void								Release( void );
 
 protected: