diff --git a/OpenRa.Game/BuildingInfluenceMap.cs b/OpenRa.Game/BuildingInfluenceMap.cs
index f207245468..c85b19840f 100644
--- a/OpenRa.Game/BuildingInfluenceMap.cs
+++ b/OpenRa.Game/BuildingInfluenceMap.cs
@@ -11,6 +11,7 @@ namespace OpenRa.Game
 {
 	class BuildingInfluenceMap
 	{
+		bool[,] blocked = new bool[128, 128];
 		Pair<Actor, float>[,] influence = new Pair<Actor, float>[128, 128];
 		readonly int maxDistance;	/* clip limit for voronoi cells */
 		static readonly Pair<Actor, float> NoClaim = Pair.New((Actor)null, float.MaxValue);
@@ -41,6 +42,10 @@ namespace OpenRa.Game
 
 			var initialTileCount = 0;
 
+			foreach (var u in Footprint.UnpathableTiles(a.unitInfo, a.Location))
+				if (IsValid(u))
+					blocked[u.X, u.Y] = true;
+
 			foreach (var t in tiles)
 				if (IsValid(t))
 				{
@@ -103,6 +108,10 @@ namespace OpenRa.Game
 				tiles.Aggregate(int2.Min) - new int2(maxDistance, maxDistance));
 			var max = int2.Min(new int2(128, 128),
 				tiles.Aggregate(int2.Max) + new int2(maxDistance, maxDistance));
+
+			foreach (var u in Footprint.UnpathableTiles(a.unitInfo, a.Location))
+				if (IsValid(u))
+					blocked[u.X, u.Y] = false;
 			
 			for (var j = min.Y; j <= max.Y; j++)
 				for (var i = min.X; i <= max.X; i++)
@@ -149,6 +158,11 @@ namespace OpenRa.Game
 			return (int)influence[cell.X, cell.Y].Second;
 		}
 
+		public bool CanMoveHere(int2 cell)
+		{
+			return IsValid(cell) && !blocked[cell.X, cell.Y];
+		}
+
 		struct Cell : IComparable<Cell>
 		{
 			public int2 location;
diff --git a/OpenRa.Game/PathFinder.cs b/OpenRa.Game/PathFinder.cs
index 395251755a..c2d443bffc 100644
--- a/OpenRa.Game/PathFinder.cs
+++ b/OpenRa.Game/PathFinder.cs
@@ -52,7 +52,7 @@ namespace OpenRa.Game
 			for( int i = 0 ; i < path.Count ; i++ )
 			{
 				var sl = path[ i ];
-				if( i == 0 || Game.BuildingInfluence.GetBuildingAt( path[ i ] ) == null & Game.UnitInfluence.GetUnitAt( path[ i ] ) == null )
+				if( i == 0 || (Game.BuildingInfluence.CanMoveHere(path[i]) && Game.UnitInfluence.GetUnitAt( path[ i ] ) == null) )
 				{
 					queue.Add( new PathDistance( estimator( sl ), sl ) );
 					cellInfo[ sl.X, sl.Y ] = new CellInfo( cost, prev, false );
@@ -105,7 +105,7 @@ namespace OpenRa.Game
 						continue;
 					if( passableCost[(int)umt][ newHere.X, newHere.Y ] == double.PositiveInfinity )
 						continue;
-					if (Game.BuildingInfluence.GetBuildingAt(newHere) != null)
+					if (!Game.BuildingInfluence.CanMoveHere(newHere))
 						continue;
 					if( checkForBlock && Game.UnitInfluence.GetUnitAt( newHere ) != null )
 						continue;
diff --git a/OpenRa.Game/Traits/Activities/DeliverOre.cs b/OpenRa.Game/Traits/Activities/DeliverOre.cs
index 82b536aae4..7d5e2d0e5f 100644
--- a/OpenRa.Game/Traits/Activities/DeliverOre.cs
+++ b/OpenRa.Game/Traits/Activities/DeliverOre.cs
@@ -15,6 +15,12 @@ namespace OpenRa.Game.Traits.Activities
 		{
 			if (isDone)
 			{
+				var harv = self.traits.Get<Harvester>();
+
+				/* todo: give cash */
+				harv.gemsCarried = 0;
+				harv.oreCarried = 0;
+
 				mobile.InternalSetActivity(NextActivity);
 				/* todo: return to the ore patch */
 				return;
diff --git a/OpenRa.Game/Traits/Activities/Move.cs b/OpenRa.Game/Traits/Activities/Move.cs
index 89fd565f2a..8a0b35c5ca 100755
--- a/OpenRa.Game/Traits/Activities/Move.cs
+++ b/OpenRa.Game/Traits/Activities/Move.cs
@@ -33,9 +33,9 @@ namespace OpenRa.Game.Traits.Activities
 
 		static bool CanEnterCell( int2 c, Actor self )
 		{
+			if (!Game.BuildingInfluence.CanMoveHere(c)) return false;
 			var u = Game.UnitInfluence.GetUnitAt( c );
-			var b = Game.BuildingInfluence.GetBuildingAt( c );
-			return ( u == null || u == self ) && b == null;
+			return (u == null || u == self);
 		}
 
 		public void Tick( Actor self, Mobile mobile )
diff --git a/OpenRa.Game/Traits/Harvester.cs b/OpenRa.Game/Traits/Harvester.cs
index a9a2ca89f5..a7988556c3 100644
--- a/OpenRa.Game/Traits/Harvester.cs
+++ b/OpenRa.Game/Traits/Harvester.cs
@@ -8,8 +8,8 @@ namespace OpenRa.Game.Traits
 	class Harvester : IOrder
 	{
 		const int capacity = 28;
-		int oreCarried = 0;					/* sum of these must not exceed capacity */
-		int gemsCarried = 0;
+		public int oreCarried = 0;					/* sum of these must not exceed capacity */
+		public int gemsCarried = 0;
 
 		public bool IsFull { get { return oreCarried + gemsCarried == capacity; } }
 		public bool IsEmpty { get { return oreCarried == 0 && gemsCarried == 0; } }