diff --git a/spine-cpp/spine-cpp/include/spine/Bone.h b/spine-cpp/spine-cpp/include/spine/Bone.h
index 90f0aced2..7c53435aa 100644
--- a/spine-cpp/spine-cpp/include/spine/Bone.h
+++ b/spine-cpp/spine-cpp/include/spine/Bone.h
@@ -243,10 +243,6 @@ namespace spine {
 		/// Returns the magnitide (always positive) of the world scale Y.
 		float getWorldScaleY();
 
-		bool isAppliedValid();
-
-		void setAppliedValid(bool valid);
-
 		bool isActive();
 
 		void setActive(bool inValue);
@@ -260,7 +256,6 @@ namespace spine {
 		Vector<Bone *> _children;
 		float _x, _y, _rotation, _scaleX, _scaleY, _shearX, _shearY;
 		float _ax, _ay, _arotation, _ascaleX, _ascaleY, _ashearX, _ashearY;
-		bool _appliedValid;
 		float _a, _b, _worldX;
 		float _c, _d, _worldY;
 		bool _sorted;
diff --git a/spine-cpp/spine-cpp/src/spine/Bone.cpp b/spine-cpp/spine-cpp/src/spine/Bone.cpp
index cf8631afe..8a57b31ad 100644
--- a/spine-cpp/spine-cpp/src/spine/Bone.cpp
+++ b/spine-cpp/spine-cpp/src/spine/Bone.cpp
@@ -68,7 +68,6 @@ Bone::Bone(BoneData &data, Skeleton &skeleton, Bone *parent) : Updatable(),
 															   _ascaleY(0),
 															   _ashearX(0),
 															   _ashearY(0),
-															   _appliedValid(false),
 															   _a(1),
 															   _b(0),
 															   _worldX(0),
@@ -81,7 +80,7 @@ Bone::Bone(BoneData &data, Skeleton &skeleton, Bone *parent) : Updatable(),
 }
 
 void Bone::update() {
-	updateWorldTransform(_x, _y, _rotation, _scaleX, _scaleY, _shearX, _shearY);
+	updateWorldTransform(_ax, _ay, _arotation, _ascaleX, _ascaleY, _ashearX, _ashearY);
 }
 
 void Bone::updateWorldTransform() {
@@ -101,7 +100,6 @@ Bone::updateWorldTransform(float x, float y, float rotation, float scaleX, float
 	_ascaleY = scaleY;
 	_ashearX = shearX;
 	_ashearY = shearY;
-	_appliedValid = true;
 
 	if (!parent) { /* Root bone. */
 		float rotationY = rotation + 90 + shearY;
@@ -267,8 +265,6 @@ void Bone::rotateWorld(float degrees) {
 	_b = cos * b - sin * d;
 	_c = sin * a + cos * c;
 	_d = sin * b + cos * d;
-
-	_appliedValid = false;
 }
 
 float Bone::getWorldToLocalRotationX() {
@@ -495,17 +491,8 @@ float Bone::getWorldScaleY() {
 	return MathUtil::sqrt(_b * _b + _d * _d);
 }
 
-bool Bone::isAppliedValid() {
-	return _appliedValid;
-}
-
-void Bone::setAppliedValid(bool valid) {
-	_appliedValid = valid;
-}
-
 void Bone::updateAppliedTransform() {
 	Bone *parent = _parent;
-	_appliedValid = 1;
 	if (!parent) {
 		_ax = _worldX;
 		_ay = _worldY;
diff --git a/spine-cpp/spine-cpp/src/spine/IkConstraint.cpp b/spine-cpp/spine-cpp/src/spine/IkConstraint.cpp
index 1303543bc..de9113eed 100644
--- a/spine-cpp/spine-cpp/src/spine/IkConstraint.cpp
+++ b/spine-cpp/spine-cpp/src/spine/IkConstraint.cpp
@@ -49,7 +49,6 @@ IkConstraint::apply(Bone &bone, float targetX, float targetY, bool compress, boo
 	float pa = p->_a, pb = p->_b, pc = p->_c, pd = p->_d;
 	float rotationIK = -bone._ashearX - bone._arotation;
 	float tx = 0, ty = 0;
-	if (!bone._appliedValid) bone.updateAppliedTransform();
 
 	switch (bone._data.getTransformMode()) {
 		case TransformMode_OnlyTranslation:
@@ -105,8 +104,6 @@ IkConstraint::apply(Bone &parent, Bone &child, float targetX, float targetY, int
 	Bone *pp = parent.getParent();
 	float tx, ty, dx, dy, dd, l1, l2, a1, a2, r, td, sd, p;
 	float id, x, y;
-	if (!parent._appliedValid) parent.updateAppliedTransform();
-	if (!child._appliedValid) child.updateAppliedTransform();
 	px = parent._ax;
 	py = parent._ay;
 	psx = parent._ascaleX;
diff --git a/spine-cpp/spine-cpp/src/spine/PathConstraint.cpp b/spine-cpp/spine-cpp/src/spine/PathConstraint.cpp
index 6f81496ad..1000802e8 100644
--- a/spine-cpp/spine-cpp/src/spine/PathConstraint.cpp
+++ b/spine-cpp/spine-cpp/src/spine/PathConstraint.cpp
@@ -220,7 +220,7 @@ void PathConstraint::update() {
 			bone._d = sin * b + cos * d;
 		}
 
-		bone._appliedValid = false;
+		bone.updateAppliedTransform();
 	}
 }
 
diff --git a/spine-cpp/spine-cpp/src/spine/Skeleton.cpp b/spine-cpp/spine-cpp/src/spine/Skeleton.cpp
index b0f4050ac..8149fcc14 100644
--- a/spine-cpp/spine-cpp/src/spine/Skeleton.cpp
+++ b/spine-cpp/spine-cpp/src/spine/Skeleton.cpp
@@ -212,6 +212,17 @@ void Skeleton::printUpdateCache() {
 }
 
 void Skeleton::updateWorldTransform() {
+	for (size_t i = 0, n = _bones.size(); i < n; i++) {
+		Bone *bone = _bones[i];
+		bone->_ax = bone->_x;
+		bone->_ay = bone->_y;
+		bone->_arotation = bone->_rotation;
+		bone->_ascaleX = bone->_scaleX;
+		bone->_ascaleY = bone->_scaleY;
+		bone->_ashearX = bone->_shearX;
+		bone->_ashearY = bone->_shearY;
+	}
+
 	for (size_t i = 0, n = _updateCache.size(); i < n; ++i) {
 		_updateCache[i]->update();
 	}
diff --git a/spine-cpp/spine-cpp/src/spine/Slot.cpp b/spine-cpp/spine-cpp/src/spine/Slot.cpp
index f1ee36ea5..4bae667af 100644
--- a/spine-cpp/spine-cpp/src/spine/Slot.cpp
+++ b/spine-cpp/spine-cpp/src/spine/Slot.cpp
@@ -37,6 +37,7 @@
 #include <spine/Bone.h>
 #include <spine/Skeleton.h>
 #include <spine/Attachment.h>
+#include <spine/VertexAttachment.h>
 
 using namespace spine;
 
@@ -99,9 +100,17 @@ void Slot::setAttachment(Attachment *inValue) {
 		return;
 	}
 
+	if (inValue && _attachment) {
+		if (!(inValue->getRTTI().instanceOf(VertexAttachment::rtti)) ||
+			!(_attachment->getRTTI().instanceOf(VertexAttachment::rtti))
+			|| (static_cast<VertexAttachment *>(inValue)->getDeformAttachment() !=
+				(static_cast<VertexAttachment *>(_attachment)->getDeformAttachment()))) {
+			_deform.clear();
+		}
+	}
+
 	_attachment = inValue;
 	_attachmentTime = _skeleton.getTime();
-	_deform.clear();
 }
 
 int Slot::getAttachmentState() {
diff --git a/spine-cpp/spine-cpp/src/spine/TransformConstraint.cpp b/spine-cpp/spine-cpp/src/spine/TransformConstraint.cpp
index 16e5f0e2e..c3f9fb046 100644
--- a/spine-cpp/spine-cpp/src/spine/TransformConstraint.cpp
+++ b/spine-cpp/spine-cpp/src/spine/TransformConstraint.cpp
@@ -213,7 +213,7 @@ void TransformConstraint::applyAbsoluteWorld() {
 			bone._d = MathUtil::sin(r) * s;
 		}
 
-		bone._appliedValid = false;
+		bone.updateAppliedTransform();
 	}
 }
 
@@ -276,21 +276,18 @@ void TransformConstraint::applyRelativeWorld() {
 			bone._d = MathUtil::sin(r) * s;
 		}
 
-		bone._appliedValid = false;
+		bone.updateAppliedTransform();
 	}
 }
 
 void TransformConstraint::applyAbsoluteLocal() {
 	float mixRotate = _mixRotate, mixX = _mixX, mixY = _mixY, mixScaleX = _mixScaleX, mixScaleY = _mixScaleY, mixShearY = _mixShearY;
 	Bone &target = *_target;
-	if (!target._appliedValid) target.updateAppliedTransform();
 
 	for (size_t i = 0; i < _bones.size(); ++i) {
 		Bone *item = _bones[i];
 		Bone &bone = *item;
 
-		if (!bone._appliedValid) bone.updateAppliedTransform();
-
 		float rotation = bone._arotation;
 		if (mixRotate != 0) {
 			float r = target._arotation - rotation + _data._offsetRotation;
@@ -322,14 +319,11 @@ void TransformConstraint::applyAbsoluteLocal() {
 void TransformConstraint::applyRelativeLocal() {
 	float mixRotate = _mixRotate, mixX = _mixX, mixY = _mixY, mixScaleX = _mixScaleX, mixScaleY = _mixScaleY, mixShearY = _mixShearY;
 	Bone &target = *_target;
-	if (!target._appliedValid) target.updateAppliedTransform();
 
 	for (size_t i = 0; i < _bones.size(); ++i) {
 		Bone *item = _bones[i];
 		Bone &bone = *item;
 
-		if (!bone._appliedValid) bone.updateAppliedTransform();
-
 		float rotation = bone._arotation + (target._arotation + _data._offsetRotation) * mixRotate;
 		float x = bone._ax + (target._ax + _data._offsetX) * mixX;
 		float y = bone._ay + (target._ay + _data._offsetY) * mixY;
diff --git a/spine-sfml/c/example/main.cpp b/spine-sfml/c/example/main.cpp
index 86928b869..cbd9d216e 100644
--- a/spine-sfml/c/example/main.cpp
+++ b/spine-sfml/c/example/main.cpp
@@ -252,7 +252,6 @@ void goblins (spSkeletonData* skeletonData, spAtlas* atlas) {
 	spSkeleton_updateWorldTransform(skeleton);
 
 	spAnimationState_setAnimationByName(drawable->state, 0, "walk", true);
-    drawable->update(0.3f);
 
 	sf::RenderWindow window(sf::VideoMode(640, 640), "Spine SFML - goblins");
 	window.setFramerateLimit(60);
@@ -262,10 +261,10 @@ void goblins (spSkeletonData* skeletonData, spAtlas* atlas) {
 		while (window.pollEvent(event))
 			if (event.type == sf::Event::Closed) window.close();
 
-		// float delta = deltaClock.getElapsedTime().asSeconds();
+		float delta = deltaClock.getElapsedTime().asSeconds();
 		deltaClock.restart();
 
-		drawable->update(0);
+		drawable->update(delta);
 
 		window.clear();
 		window.draw(*drawable);
diff --git a/spine-sfml/cpp/example/main.cpp b/spine-sfml/cpp/example/main.cpp
index b74366f83..16620e99a 100644
--- a/spine-sfml/cpp/example/main.cpp
+++ b/spine-sfml/cpp/example/main.cpp
@@ -223,7 +223,6 @@ void ikDemo (SkeletonData* skeletonData, Atlas* atlas) {
         crosshair->getParent()->worldToLocal(mouseCoords.x, mouseCoords.y, boneCoordsX, boneCoordsY);
         crosshair->setX(boneCoordsX);
         crosshair->setY(boneCoordsY);
-        crosshair->setAppliedValid(false);
 
         // Calculate final world transform with the
         // crosshair bone set to the mouse cursor
@@ -251,8 +250,6 @@ void goblins (SkeletonData* skeletonData, Atlas* atlas) {
 
 	drawable.state->setAnimation(0, "walk", true);
 
-    drawable.update(0.3f);
-
 	sf::RenderWindow window(sf::VideoMode(640, 640), "Spine SFML - goblins");
 	window.setFramerateLimit(60);
 	sf::Event event;
@@ -261,10 +258,10 @@ void goblins (SkeletonData* skeletonData, Atlas* atlas) {
 		while (window.pollEvent(event))
 			if (event.type == sf::Event::Closed) window.close();
 
-		// float delta = deltaClock.getElapsedTime().asSeconds();
+		float delta = deltaClock.getElapsedTime().asSeconds();
 		deltaClock.restart();
 
-		drawable.update(0);
+		drawable.update(delta);
 
 		window.clear();
 		window.draw(drawable);