Index: ps/trunk/binaries/data/mods/public/simulation/components/UnitAI.js
===================================================================
--- ps/trunk/binaries/data/mods/public/simulation/components/UnitAI.js
+++ ps/trunk/binaries/data/mods/public/simulation/components/UnitAI.js
@@ -957,13 +957,30 @@
 			},
 
 			"leave": function() {
+				this.StopTimer();
 				this.StopMoving();
 			},
 
 			"MovementUpdate": function(msg) {
+				if (msg.veryObstructed && !this.timer)
+				{
+					// It's possible that the controller (with large clearance)
+					// is stuck, but not the individual units.
+					// Ask them to move individually for a little while.
+					this.CallMemberFunction("MoveTo", [this.order.data]);
+					this.StartTimer(3000);
+					return;
+				}
+				else if (this.timer)
+					return;
 				if (msg.likelyFailure || this.CheckRange(this.order.data))
 					this.FinishOrder();
 			},
+
+			"Timer": function() {
+				// Reenter to reset the pathfinder state.
+				this.SetNextState("WALKING");
+			}
 		},
 
 		"WALKINGANDFIGHTING": {
@@ -1240,8 +1257,8 @@
 		"MEMBER": {
 			"OrderTargetRenamed": function(msg) {
 				// In general, don't react - we don't want to send spurious messages to members.
-				// This looks odd for hunting hwoever because we wait for all
-				// entities to ahve clumped around the dead resource before proceeding
+				// This looks odd for hunting however because we wait for all
+				// entities to have clumped around the dead resource before proceeding
 				// so explicitly handle this case.
 				if (this.order && this.order.data && this.order.data.hunting &&
 				     this.order.data.target == msg.data.newentity &&
@@ -4222,6 +4239,8 @@
 
 UnitAI.prototype.OnMotionUpdate = function(msg)
 {
+	if (msg.veryObstructed)
+		msg.obstructed = true;
 	this.UnitFsm.ProcessMessage(this, Object.assign({ "type": "MovementUpdate" }, msg));
 };
 
Index: ps/trunk/source/simulation2/MessageTypes.h
===================================================================
--- ps/trunk/source/simulation2/MessageTypes.h
+++ ps/trunk/source/simulation2/MessageTypes.h
@@ -327,7 +327,8 @@
 	enum UpdateType {
 		LIKELY_SUCCESS, // UnitMotion considers it is arrived at destination.
 		LIKELY_FAILURE, // UnitMotion says it cannot reach the destination.
-		OBSTRUCTED, // UitMotion was obstructed. This does not mean stuck, but can be a hint to run range checks.
+		OBSTRUCTED, // UnitMotion was obstructed. This does not mean stuck, but can be a hint to run range checks.
+		VERY_OBSTRUCTED, // Sent when obstructed several time in a row.
 		LENGTH
 	};
 
Index: ps/trunk/source/simulation2/components/CCmpUnitMotion.cpp
===================================================================
--- ps/trunk/source/simulation2/components/CCmpUnitMotion.cpp
+++ ps/trunk/source/simulation2/components/CCmpUnitMotion.cpp
@@ -105,6 +105,12 @@
 static const u8 ALTERNATE_PATH_TYPE_DELAY = 3;
 static const u8 ALTERNATE_PATH_TYPE_EVERY = 6;
 
+/**
+ * After this many failed computations, start sending "VERY_OBSTRUCTED" messages instead.
+ * Should probably be larger than ALTERNATE_PATH_TYPE_DELAY.
+ */
+static const u8 VERY_OBSTRUCTED_THRESHOLD = 10;
+
 static const CColor OVERLAY_COLOR_LONG_PATH(1, 1, 1, 1);
 static const CColor OVERLAY_COLOR_SHORT_PATH(1, 0, 0, 1);
 
@@ -557,7 +563,8 @@
 		if (IsFormationMember() && IsFormationControllerMoving())
 			return;
 
-		CMessageMotionUpdate msg(CMessageMotionUpdate::OBSTRUCTED);
+		CMessageMotionUpdate msg(m_FailedMovements >= VERY_OBSTRUCTED_THRESHOLD ?
+			CMessageMotionUpdate::VERY_OBSTRUCTED : CMessageMotionUpdate::OBSTRUCTED);
 		GetSimContext().GetComponentManager().PostMessage(GetEntityId(), msg);
 	}
 
Index: ps/trunk/source/simulation2/scripting/MessageTypeConversions.cpp
===================================================================
--- ps/trunk/source/simulation2/scripting/MessageTypeConversions.cpp
+++ ps/trunk/source/simulation2/scripting/MessageTypeConversions.cpp
@@ -265,7 +265,7 @@
 ////////////////////////////////
 
 const std::array<const char*, CMessageMotionUpdate::UpdateType::LENGTH> CMessageMotionUpdate::UpdateTypeStr = { {
-	"likelySuccess", "likelyFailure", "obstructed"
+	"likelySuccess", "likelyFailure", "obstructed", "veryObstructed"
 } };
 
 JS::Value CMessageMotionUpdate::ToJSVal(const ScriptInterface& scriptInterface) const
@@ -290,6 +290,8 @@
 		return new CMessageMotionUpdate(CMessageMotionUpdate::LIKELY_FAILURE);
 	if (updateString == L"obstructed")
 		return new CMessageMotionUpdate(CMessageMotionUpdate::OBSTRUCTED);
+	if (updateString == L"veryObstructed")
+		return new CMessageMotionUpdate(CMessageMotionUpdate::VERY_OBSTRUCTED);
 
 	LOGWARNING("CMessageMotionUpdate::FromJSVal passed wrong updateString");
 	return NULL;