diff --git a/blocks.py b/blocks.py
index 00f98d8..2e181f1 100644
--- a/blocks.py
+++ b/blocks.py
@@ -22,8 +22,7 @@ SINGLE_SNOW = 3921
 #SOUL_TORCH = 4008
 SOUL_TORCH = 1435
 
-#TEST_BLOCK = (616, 78, 496)
-TEST_BLOCK = (-100, 64, -167)
+TEST_BLOCK = (616, 78, 496)
 
 
 AVOID = [
diff --git a/game.py b/game.py
index 76157f6..bb34a38 100644
--- a/game.py
+++ b/game.py
@@ -10,7 +10,8 @@ from panda3d.core import LPoint3f
 from minecraft.networking.packets import Packet, clientbound, serverbound
 from minecraft.networking.types import BlockFace
 
-from protocol.packets import TimeUpdatePacket, SetSlotPacket, PlayerDiggingPacket, BlockBreakAnimationPacket, AcknowledgePlayerDiggingPacket, HeldItemChangePacket, PickItemPacket, OpenWindowPacket, ClickWindowPacket, CloseWindowPacket
+from protocol.packets import TimeUpdatePacket, SetSlotPacket, PlayerDiggingPacket, BlockBreakAnimationPacket, AcknowledgePlayerDiggingPacket, HeldItemChangePacket, PickItemPacket, OpenWindowPacket, ClickWindowPacket, CloseWindowPacket, ServerWindowConfirmationPacket, ClientWindowConfirmationPacket
+from protocol.types import Slot
 
 import utils
 importlib.reload(utils)
@@ -186,6 +187,7 @@ class Game:
         register(self.handle_break_animation, BlockBreakAnimationPacket)
         register(self.handle_break_ack, AcknowledgePlayerDiggingPacket)
         register(self.handle_window, OpenWindowPacket)
+        register(self.handle_window_confirmation, ClientWindowConfirmationPacket)
 
         self.g.chat.set_handler(self.handle_chat)
 
@@ -302,6 +304,9 @@ class Game:
                     inv_list.append('{}:{} x {}'.format(items.ITEM_NAMES[i.item_id], str(i.item_id), i.item_count))
             reply = ', '.join(inv_list)
 
+            if not reply:
+                reply = 'empty'
+
         if command == 'drop':
             self.drop_stack()
 
@@ -334,10 +339,13 @@ class Game:
 
         if command == 'click' and data:
             if self.g.window:
-                window_id, slot, button, mode = [int(x) for x in data.split(' ')]
-                item = self.g.window.contents[slot]
+                slot, button, mode = [int(x) for x in data.split(' ')]
+                try:
+                    item = self.g.window.contents[slot]
+                except KeyError:
+                    item = Slot(present=False, item_id=None, item_count=None, nbt=None)
                 print(item)
-                self.click_window(window_id, slot, button, mode, item)
+                self.click_window(slot, button, mode, item)
             else:
                 reply = 'nothing open'
 
@@ -356,7 +364,8 @@ class Game:
         elif g.window:
             g.window.contents[packet.slot] = packet.slot_data
 
-        if not packet.slot_data.present:
+        if packet.window_id >= 0 and not packet.slot_data.present:
+            print('unlocking item lock')
             g.item_lock = False
 
     def break_block(self, location):
@@ -451,17 +460,22 @@ class Game:
 
     def handle_window(self, packet):
         print(packet)
-        self.g.window = Bunch(data=packet, contents=dict())
+        self.g.window = Bunch(data=packet, contents=dict(), count=0)
+
+    def click_window(self, slot, button, mode, item):
+        w = self.g.window
 
-    def click_window(self, window_id, slot, button, mode, item):
         packet = ClickWindowPacket()
-        packet.window_id = window_id
+        packet.window_id = w.data.window_id
         packet.slot = slot
         packet.button = button
-        packet.action_number = 1
+        packet.action_number = w.count
         packet.mode = mode
         packet.clicked_item = item
         self.g.connection.write_packet(packet)
+        print('<--', packet)
+
+        w.count += 1
 
     def close_window(self):
         packet = CloseWindowPacket()
@@ -469,6 +483,13 @@ class Game:
         self.g.connection.write_packet(packet)
         self.g.window = None
 
+    def handle_window_confirmation(self, packet):
+        print(packet)
+        packet2 = ServerWindowConfirmationPacket()
+        packet2.window_id = packet.window_id
+        packet2.action_number = packet.action_number
+        packet2.accepted = packet.accepted
+        self.g.connection.write_packet(packet2)
 
     def tick(self):
         if self.g.breaking:
diff --git a/jobs.py b/jobs.py
index b81e89e..0461ada 100644
--- a/jobs.py
+++ b/jobs.py
@@ -15,6 +15,8 @@ import blocks
 importlib.reload(blocks)
 import items
 importlib.reload(items)
+import data
+importlib.reload(data)
 
 
 class LumberjackStates:
@@ -377,9 +379,10 @@ class CacheItemsStates:
         return None
 
     def init(self):
-        #if len(self.g.inv) >= 27:
-        if len(self.g.inv) >= 2:
-            self.state = self.find_chest_spot
+        num_stacks = len(self.g.inv)
+        print('inventory amount:', num_stacks)
+        if num_stacks >= 27:
+            self.state = self.find_cache_spot
         else:
             print('Aborting caching, not full')
             self.state = self.cleanup
@@ -453,8 +456,8 @@ class CacheItemsStates:
         if self.g.item_lock: return
 
         w = self.g.window
-        w_data = data.WINDOWS[w.window_type]
-        w_inventory_slots = w_data.inventory
+        w_info = data.WINDOWS[w.data.window_type]
+        w_inventory_slots = w_info.inventory
 
         for slot_num in w_inventory_slots:
             if slot_num not in w.contents:
@@ -462,24 +465,28 @@ class CacheItemsStates:
 
             slot = w.contents[slot_num]
 
+            if not slot.present:
+                continue
+
             if slot.item_id in items.USEFUL_ITEMS:
                 continue
 
             print('moving', slot)
 
-            inv_slot_num = slot_num - w_data.slot_diff
+            inv_slot_num = slot_num - w_info.slot_diff
             self.g.inv.pop(inv_slot_num, None)
 
             self.g.item_lock = True
-            self.g.game.click_window(w.window_id, slot_num, 0, 1, slot)
+            self.g.game.click_window(slot_num, 0, 1, slot)
             return
 
         print('nothing left to move')
-        self.state = close_chest
+        self.state = self.close_chest
 
     def close_chest(self):
         print('closing chest')
         self.g.game.close_window()
+        self.g.chat.send('cache at ' + str(self.area)[1:-1])
         self.state = self.cleanup
 
     def cleanup(self):
diff --git a/monkey_patch.py b/monkey_patch.py
index 99b1378..c4eaf81 100644
--- a/monkey_patch.py
+++ b/monkey_patch.py
@@ -18,6 +18,8 @@ def get_packets(old_get_packets):
         mc_packets.add(packets.OpenWindowPacket)
         mc_packets.add(packets.CloseWindowPacket)
         mc_packets.add(packets.ClickWindowPacket)
+        mc_packets.add(packets.ClientWindowConfirmationPacket)
+        mc_packets.add(packets.ServerWindowConfirmationPacket)
 
         return mc_packets
     return lambda x: wrapper(old_get_packets, x)
diff --git a/protocol/packets.py b/protocol/packets.py
index 5f069d2..f2f5ce9 100644
--- a/protocol/packets.py
+++ b/protocol/packets.py
@@ -259,3 +259,30 @@ class ClickWindowPacket(Packet):
         {'mode': VarInt},
         {'clicked_item': Slot},
     ]
+
+
+class ClientWindowConfirmationPacket(Packet):
+    # Sent by the server indicating whether a request from the client was accepted
+    # https://wiki.vg/Protocol#Window_Confirmation_.28clientbound.29
+
+    id = 0x11
+    packet_name = 'client window confirmation'
+
+    definition = [
+        {'window_id': Byte},
+        {'action_number': Short},
+        {'accepted': Boolean},
+    ]
+
+class ServerWindowConfirmationPacket(Packet):
+    # Sent by the client to confirm an unaccepted click
+    # https://wiki.vg/Protocol#Window_Confirmation_.28serverbound.29
+
+    id = 0x07
+    packet_name = 'client window confirmation'
+
+    definition = [
+        {'window_id': Byte},
+        {'action_number': Short},
+        {'accepted': Boolean},
+    ]