OK, I'm pretty sure I fixed #7 and fixed #8 this time.

I redid the large chest contents.  I think what was happening before is
that the data for tile entity #2 was getting put in the slot for TE #1
(and vice versa) when one of the sides was getting clicked
(specifically, the south on an east/west facing chest), and minecraft
just didn't like that.  Plus, the issue from 12d5bd9 (positions getting
mixed up) also caried caused issues.

src/wdl/WDLEvents.java

@@ -307,47 +307,83 @@ public static void onItemGuiClosed() {
 			if (WDL.windowContainer instanceof ContainerChest
 					&& te instanceof TileEntityChest) {
 				if (WDL.windowContainer.inventorySlots.size() > 63) {
-					TileEntity te2;
-					BlockPos chestPos1 = WDL.lastClickedBlock;
-					BlockPos chestPos2;
-					TileEntityChest tec1, tec2;
-
-					if ((te2 = WDL.worldClient.getTileEntity(chestPos1.add(0, 0, 1))) instanceof TileEntityChest
-							&& ((TileEntityChest) te2).getChestType() == ((TileEntityChest) te)
-							.getChestType()) {
-						tec1 = (TileEntityChest) te;
-						tec2 = (TileEntityChest) te2;
-						chestPos2 = chestPos1.add(0, 0, 1);
-					} else if ((te2 = WDL.worldClient.getTileEntity(chestPos1.add(0, 0,
-							-1))) instanceof TileEntityChest
-							&& ((TileEntityChest) te2).getChestType() == ((TileEntityChest) te)
-							.getChestType()) {
-						tec1 = (TileEntityChest) te2;
-						tec2 = (TileEntityChest) te;
-						chestPos2 = chestPos1.add(0, 0, -1);
-					} else if ((te2 = WDL.worldClient.getTileEntity(chestPos1.add(1, 0,
-							0))) instanceof TileEntityChest
-							&& ((TileEntityChest) te2).getChestType() == ((TileEntityChest) te)
-							.getChestType()) {
-						tec1 = (TileEntityChest) te;
-						tec2 = (TileEntityChest) te2;
-						chestPos2 = chestPos1.add(1, 0, 0);
-					} else if ((te2 = WDL.worldClient.getTileEntity(chestPos1.add(-1,
-							0, 0))) instanceof TileEntityChest
-							&& ((TileEntityChest) te2).getChestType() == ((TileEntityChest) te)
-							.getChestType()) {
-						tec1 = (TileEntityChest) te2;
-						tec2 = (TileEntityChest) te;
-						chestPos2 = chestPos1.add(-1, 0, 0);
-					} else {
-						WDL.chatMsg("Could not save this chest!");
+					// This is messy, but it needs to be like this because
+					// the left and right chests must be in the right positions.
+
+					BlockPos pos1, pos2;
+					TileEntity te1, te2;
+
+					pos1 = WDL.lastClickedBlock;
+					te1 = te;
+
+					// We need seperate variables for the above reason -- 
+					// pos1 isn't always the same as chestPos1 (and thus
+					// chest1 isn't always te1).
+					BlockPos chestPos1 = null, chestPos2 = null;
+					TileEntityChest chest1 = null, chest2 = null;
+
+					pos2 = pos1.add(0, 0, 1);
+					te2 = WDL.worldClient.getTileEntity(pos2);
+					if (te2 instanceof TileEntityChest && 
+							((TileEntityChest) te2).getChestType() == 
+							((TileEntityChest) te1).getChestType()) {
+
+						chest1 = (TileEntityChest) te1;
+						chest2 = (TileEntityChest) te2;
+
+						chestPos1 = pos1;
+						chestPos2 = pos2;
+					}
+
+					pos2 = pos1.add(0, 0, -1);
+					te2 = WDL.worldClient.getTileEntity(pos2);
+					if (te2 instanceof TileEntityChest && 
+							((TileEntityChest) te2).getChestType() == 
+							((TileEntityChest) te1).getChestType()) {
+
+						chest1 = (TileEntityChest) te2;
+						chest2 = (TileEntityChest) te1;
+
+						chestPos1 = pos2;
+						chestPos2 = pos1;
+					}
+
+					pos2 = pos1.add(1, 0, 0);
+					te2 = WDL.worldClient.getTileEntity(pos2);
+					if (te2 instanceof TileEntityChest && 
+							((TileEntityChest) te2).getChestType() == 
+							((TileEntityChest) te1).getChestType()) {
+						chest1 = (TileEntityChest) te1;
+						chest2 = (TileEntityChest) te2;
+
+						chestPos1 = pos1;
+						chestPos2 = pos2;
+					}
+
+					pos2 = pos1.add(-1, 0, 0);
+					te2 = WDL.worldClient.getTileEntity(pos2);
+					if (te2 instanceof TileEntityChest && 
+							((TileEntityChest) te2).getChestType() == 
+							((TileEntityChest) te1).getChestType()) {
+						chest1 = (TileEntityChest) te2;
+						chest2 = (TileEntityChest) te1;
+
+						chestPos1 = pos2;
+						chestPos2 = pos1;
+					}
+
+					if (chest1 == null || chest2 == null || 
+							chestPos1 == null || chestPos2 == null) {
+						WDL.chatError("Could not save this double chest!");
+						WDL.chatError("Not all chest blocks were found!");
 						return;
 					}
 
-					WDL.saveContainerItems(WDL.windowContainer, tec1, 0);
-					WDL.saveContainerItems(WDL.windowContainer, tec2, 27);
-					WDL.newTileEntities.put(chestPos1, tec1);
-					WDL.newTileEntities.put(chestPos2, tec2);
+					WDL.saveContainerItems(WDL.windowContainer, chest1, 0);
+					WDL.saveContainerItems(WDL.windowContainer, chest2, 27);
+					WDL.newTileEntities.put(chestPos1, chest1);
+					WDL.newTileEntities.put(chestPos2, chest2);
+
 					saveName = "Double Chest contents";
 				}
 				// basic chest