diff --git a/nel/src/pacs/move_container.cpp b/nel/src/pacs/move_container.cpp
index 424f7d8b9..4d093ae6a 100644
--- a/nel/src/pacs/move_container.cpp
+++ b/nel/src/pacs/move_container.cpp
@@ -1676,7 +1676,7 @@ void CMoveContainer::reaction (const CCollisionOTInfo& first)
 						CVectorD first_pos = dynInfo->getFirstPrimitive()->getFinalPosition(dynInfo->getFirstWorldImage());
 						CVectorD second_pos = dynInfo->getSecondPrimitive()->getFinalPosition(dynInfo->getSecondWorldImage());
 						nlinfo("P = %f, C = %f, H = %f, D = %f", first_pos.z, second_pos.z, dynInfo->getSecondPrimitive()->getHeight(), second_pos.z-first_pos.z);
-						dynInfo->getFirstPrimitive()->setZOffset(second_pos.z+dynInfo->getSecondPrimitive()->getHeight()-1.0f);
+						dynInfo->getFirstPrimitive()->setZOffset(second_pos.z+dynInfo->getSecondPrimitive()->getHeight()-10.0f);
 					}
 				}
 				if (dynInfo->isExit())
diff --git a/ryzom/client/src/character_cl.cpp b/ryzom/client/src/character_cl.cpp
index 68f8acfcb..47b1ad4a2 100644
--- a/ryzom/client/src/character_cl.cpp
+++ b/ryzom/client/src/character_cl.cpp
@@ -426,7 +426,7 @@ void CCharacterCL::computePrimitive()
 	// Initialize the primitive.
 	if (_Sheet)
 	{
-		initPrimitive(_Sheet->ColRadius*getScale(), _Sheet->ColHeight*getScale(), _Sheet->ColLength, _Sheet->ColWidth, UMovePrimitive::DoNothing, UMovePrimitive::NotATrigger, MaskColNpc, MaskColNone, _Sheet->ClipRadius, _Sheet->ClipHeight);
+		initPrimitive(_Sheet->ColRadius*getScale(), _Sheet->ColHeight*getScale(), _Sheet->ColLength, _Sheet->ColWidth, UMovePrimitive::DoNothing, (UMovePrimitive::TTrigger)(UMovePrimitive::OverlapTrigger | UMovePrimitive::EnterTrigger), MaskColNpc, MaskColDoor, _Sheet->ClipRadius, _Sheet->ClipHeight);
 	}
 	else
 	{
@@ -976,7 +976,7 @@ bool CCharacterCL::build(const CEntitySheet *sheet)	// virtual
 	_CustomScalePos *= getScale();
 
 	// Create PACS Primitive.
-	initPrimitive(_Sheet->ColRadius*getScale(), _Sheet->ColHeight*getScale(), _Sheet->ColLength, _Sheet->ColWidth, UMovePrimitive::DoNothing, UMovePrimitive::NotATrigger, MaskColNpc, MaskColNone, _Sheet->ClipRadius, _Sheet->ClipHeight);
+	initPrimitive(_Sheet->ColRadius*getScale(), _Sheet->ColHeight*getScale(), _Sheet->ColLength, _Sheet->ColWidth, UMovePrimitive::DoNothing, (UMovePrimitive::TTrigger)(UMovePrimitive::OverlapTrigger | UMovePrimitive::EnterTrigger), MaskColNpc, MaskColDoor, _Sheet->ClipRadius, _Sheet->ClipHeight);
 
 	// Compute the element to be able to snap the entity to the ground.
 	computeCollisionEntity();
@@ -6678,7 +6678,7 @@ ADD_METHOD(void CCharacterCL::updatePos(const TTime &currentTimeInMs, CEntityCL
 			updatePosCombatFloat(frameTimeRemaining, target);
 		}
 		// Compute the average speed to the destination.
-		// double spd = 
+		// double spd =
 		computeSpeed();
 
 
@@ -8232,14 +8232,14 @@ float CCharacterCL::getSheetScale() const	// virtual
 // getColRadius :
 // Return the entity collision radius. (return 0.5 if there is any problem).
 //---------------------------------------------------
-float CCharacterCL::getSheetColRadius() const 
+float CCharacterCL::getSheetColRadius() const
 {
-	if(!_Sheet) 
+	if(!_Sheet)
 		return 0.5f;
 	else
 		return _Sheet->ColRadius;
 }
-	
+
 
 //---------------------------------------------------
 // getScale :
@@ -8358,7 +8358,7 @@ std::string CCharacterCL::shapeFromItem(const CItemSheet &itemSheet) const
 		sheet = itemSheet.getShape();
 
 	return sheet;
-		
+
 }// shapeFromItem //
 
 
@@ -9146,7 +9146,7 @@ void CCharacterCL::setAuraFX(uint index, const CAnimationFX *sheet)
 			bi.DelayBeforeStart = 11.5f;
 			_AttachedFXListToStart.push_front(bi);
 		}
-		else 
+		else
 		{
 			CAttachedFX::TSmartPtr fx = new CAttachedFX;
 			fx->create(*this, bi, CAttachedFX::CTargeterInfo());
diff --git a/ryzom/client/src/entities.cpp b/ryzom/client/src/entities.cpp
index a17a49e4f..3a13e0f30 100644
--- a/ryzom/client/src/entities.cpp
+++ b/ryzom/client/src/entities.cpp
@@ -945,6 +945,8 @@ bool CEntityManager::setupInstance(uint32 idx, const vector<string> &keys, const
 			float height = primitive->getHeight();
 
 			CVector size = CVector(width, depth, height);
+			if (primitive->getTriggerType() == UMovePrimitive::OverlapStairsTrigger)
+				size.z -= 10.0f;
 			float v;
 			if (getRelativeFloatFromString(values[i], v))
 			{
@@ -954,6 +956,8 @@ bool CEntityManager::setupInstance(uint32 idx, const vector<string> &keys, const
 			{
 				updateVector(param, size, v, false);
 			}
+			if (primitive->getTriggerType() == UMovePrimitive::OverlapStairsTrigger)
+				size.z += 10.0f;
 			primitive->setSize(size.x, size.y);
 			primitive->setHeight(size.z);
 		}
@@ -1028,12 +1032,12 @@ bool CEntityManager::setupInstance(uint32 idx, const vector<string> &keys, const
 		{
 			bool active;
 			fromString(values[i], active);
-			primitive->setObstacle(active);
+			primitive->setObstacle(!active);
 			if (active)
 			{
 				primitive->setReactionType(UMovePrimitive::DoNothing);
 				primitive->setTriggerType(UMovePrimitive::OverlapStairsTrigger);
-				primitive->setGlobalPosition(instance.getPos()+CVector(0, 0, 0.5f), dynamicWI);
+				primitive->setGlobalPosition(instance.getPos(), dynamicWI);
 			}
 			else
 			{
diff --git a/ryzom/client/src/main_loop.cpp b/ryzom/client/src/main_loop.cpp
index bb9a29d4d..7ce8b79fe 100644
--- a/ryzom/client/src/main_loop.cpp
+++ b/ryzom/client/src/main_loop.cpp
@@ -3080,9 +3080,9 @@ void displayPACSPrimitive()
 				// Static collision
 				if (prim->getTriggerType() == UMovePrimitive::OverlapStairsTrigger)
 				{
-					line.Color0 = CRGBA::Blue;
+					line.Color0 = CRGBA::Green;
 					isStairs = true;
-					position.z -= 1.0f;
+					position.z -= 10.0f;
 				}
 				else if (prim->getReactionType() == UMovePrimitive::DoNothing)
  				{