diff --git a/diffs/Item.diff b/diffs/Item.diff
index 2dd1fda..06e58ad 100644
--- a/diffs/Item.diff
+++ b/diffs/Item.diff
@@ -1,8 +1,8 @@
 diff --git a/src/minecraft/net/minecraft/src/Item.java b/src/minecraft/net/minecraft/src/Item.java
-index 337c513..9bc1325 100644
+index 337c513..48fbe75 100644
 --- a/src/minecraft/net/minecraft/src/Item.java
 +++ b/src/minecraft/net/minecraft/src/Item.java
-@@ -776,0 +777,20 @@ public Item SetDefaultFurnaceBurnTime(int var1)
+@@ -776,0 +777,25 @@ public Item SetDefaultFurnaceBurnTime(int var1)
 +    public boolean IsPistonPackable(ItemStack stack)
 +    {
 +        return false;
@@ -23,3 +23,8 @@ index 337c513..9bc1325 100644
 +        return 0;
 +    }
 +
++    public boolean CanItemBeUsedByPlayer(World world, int x, int y, int z, int side, EntityPlayer player, ItemStack stack)
++    {
++        return true;
++    }
++
diff --git a/diffs/ItemBlock.diff b/diffs/ItemBlock.diff
new file mode 100644
index 0000000..0188651
--- /dev/null
+++ b/diffs/ItemBlock.diff
@@ -0,0 +1,10 @@
+diff --git a/src/minecraft/net/minecraft/src/ItemBlock.java b/src/minecraft/net/minecraft/src/ItemBlock.java
+index 8f64000..0254e30 100644
+--- a/src/minecraft/net/minecraft/src/ItemBlock.java
++++ b/src/minecraft/net/minecraft/src/ItemBlock.java
+@@ -212,0 +213,5 @@ public void registerIcons(IconRegister par1IconRegister)
++
++    public boolean CanItemBeUsedByPlayer(World world, int x, int y, int z, int side, EntityPlayer player, ItemStack stack)
++    {
++        return canPlaceItemBlockOnSide(world, x, y, z, side, player, stack);
++    }
diff --git a/diffs/ThreadDownloadImageData.diff b/diffs/ThreadDownloadImageData.diff
new file mode 100644
index 0000000..99a6a2e
--- /dev/null
+++ b/diffs/ThreadDownloadImageData.diff
@@ -0,0 +1,7 @@
+diff --git a/src/minecraft/net/minecraft/src/ThreadDownloadImageData.java b/src/minecraft/net/minecraft/src/ThreadDownloadImageData.java
+index 40d8470..a9f32b5 100644
+--- a/src/minecraft/net/minecraft/src/ThreadDownloadImageData.java
++++ b/src/minecraft/net/minecraft/src/ThreadDownloadImageData.java
+@@ -26 +26 @@ public ThreadDownloadImageData(String par1, IImageBuffer par2IImageBuffer)
+-        (new ThreadDownloadImage(this, par1, par2IImageBuffer)).start();
++        (new GPEThreadDownloadImage(this, par1, par2IImageBuffer)).start();
diff --git a/patcher/GPEBTWTweak_files.zip b/patcher/GPEBTWTweak_files.zip
index ddb52fa..0ead46c 100644
Binary files a/patcher/GPEBTWTweak_files.zip and b/patcher/GPEBTWTweak_files.zip differ
diff --git a/patcher/readme.txt b/patcher/readme.txt
index 8116fd2..c4f88f1 100644
--- a/patcher/readme.txt
+++ b/patcher/readme.txt
@@ -1,8 +1,12 @@
-Grom PE's Better Than Wolves Total Conversion tweak mod v1.1
+Grom PE's Better Than Wolves Total Conversion tweak mod v1.1a
 (Compatible with Better Than Wolves V4.8911+)
 
 [********** Change Log ************]
 
+v1.1a
+
+- Fixed compatibility with BTW version "4.ABBBBURNBABYBURNAHAHAHAHAHA".
+
 v1.1
 
 - Fixed compatibility with BTW version "4.AACK".
diff --git a/patcher/scripts/tweaks_bed.js b/patcher/scripts/tweaks_bed.js
index f542035..812aaa6 100644
--- a/patcher/scripts/tweaks_bed.js
+++ b/patcher/scripts/tweaks_bed.js
@@ -285,7 +285,7 @@ function(mn)
     INSERT_BEFORE
   ).process(mn);
 });
-tweak("sq", "EntityPlayer", BOTH, "l_()V", [0xB4066F18, 0x99096FE7, 0x723C726B, 0xD6667B48, 0xD7AA7A79], "Player won't mind napping at day",
+tweak("sq", "EntityPlayer", BOTH, "l_()V", [0xB4066F18, 0x99096FE7, 0x723C726B, 0xD6667B48, 0xD7AA7A79, 0xE5047B58], "Player won't mind napping at day",
 function(mn)
 {
   for (var i = 0; i < mn.instructions.size(); i++)
diff --git a/patcher/scripts/tweaks_gamelogic.js b/patcher/scripts/tweaks_gamelogic.js
index c4e07bb..d21db5e 100644
--- a/patcher/scripts/tweaks_gamelogic.js
+++ b/patcher/scripts/tweaks_gamelogic.js
@@ -750,9 +750,9 @@ function(cn)
 });
 takeMicroblockOwnership("FCItemBlockMoulding", 0x411E0779);
 takeMicroblockOwnership("FCItemBlockSidingAndCorner", 0x411E0779);
-takeMicroblockOwnership("FCItemBlockWoodCornerStub", 0x2C60197);
-takeMicroblockOwnership("FCItemBlockWoodMouldingStub", 0x2C60197);
-takeMicroblockOwnership("FCItemBlockWoodSidingStub", 0x2C60197);
+takeMicroblockOwnership("FCItemBlockWoodCornerStub", [0x2C60197, 0x9BB02C1]);
+takeMicroblockOwnership("FCItemBlockWoodMouldingStub", [0x2C60197, 0x9BB02C1]);
+takeMicroblockOwnership("FCItemBlockWoodSidingStub", [0x2C60197, 0x9BB02C1]);
 add("Addon_Glass$BlockStainedGlass", null, BOTH, "Making Deco stained glass inherit from GPEBlockGlass",
 function(cn)
 {
@@ -955,7 +955,7 @@ function(mn)
     }
   }
 });
-tweak("ng", "EntityLiving", BOTH, "bE()F", [0x2F3E47DF, 0xB84C4738], "Restoring the effect of swiftness potions",
+tweak("ng", "EntityLiving", BOTH, "bE()F", [0x2F3E47DF, 0xB84C4738, 0x56554569], "Restoring the effect of swiftness potions",
 function(mn)
 {
   var label = LabelNode();
diff --git a/patcher/scripts/tweaks_hooks.js b/patcher/scripts/tweaks_hooks.js
index 9b98f00..b1270a3 100644
--- a/patcher/scripts/tweaks_hooks.js
+++ b/patcher/scripts/tweaks_hooks.js
@@ -271,20 +271,20 @@ if (isBTWVersionOrNewer("4.89666"))
     return true;
   });
 }
-tweak("bdr", "PlayerControllerMP", CLIENT, "a(Lsq;Laab;Lwm;IIIILarc;)Z", [0x5A6E2C5E, 0x48DE3024], "Hooking block placing decision",
+tweak("bdr", "PlayerControllerMP", CLIENT, "a(Lsq;Laab;Lwm;IIIILarc;)Z", [0x5A6E2C5E, 0x48DE3024, 0xCA582922], "Hooking block placing decision",
 function(mn)
 {
   for (var i = 0; i < mn.instructions.size(); i++)
   {
     var n = mn.instructions.get(i);
-    if (isInstance(n, "org.objectweb.asm.tree.MethodInsnNode") && n.owner.equals("xn") && n.name.equals("a") && n.desc.equals("(Laab;IIIILsq;Lwm;)Z"))
+    if (isInstance(n, "org.objectweb.asm.tree.MethodInsnNode") && /*n.owner.equals("xn") && n.name.equals("a") &&*/ n.desc.equals("(Laab;IIIILsq;Lwm;)Z"))
     {
       mn.instructions.insert(n, toInsnList(
         [
           VarInsnNode(FLOAD, 9),
           VarInsnNode(FLOAD, 10),
           VarInsnNode(FLOAD, 11),
-          MethodInsnNode(INVOKESTATIC, "GPEBTWTweak", "canPlaceItemBlock", "(Lxn;Laab;IIIILsq;Lwm;FFF)Z"),
+          MethodInsnNode(INVOKESTATIC, "GPEBTWTweak", "canPlaceItemBlock", "(Lwk;Laab;IIIILsq;Lwm;FFF)Z"),
         ]
       ));
       mn.instructions.remove(n);
diff --git a/patcher/scripts/tweaks_vercompat.js b/patcher/scripts/tweaks_vercompat.js
index 0a7993c..a426440 100644
--- a/patcher/scripts/tweaks_vercompat.js
+++ b/patcher/scripts/tweaks_vercompat.js
@@ -48,3 +48,29 @@ if (isBTWVersionOrNewer("4.AABABABA"))
   // tweaking overrides adapting, so have to call it manually
   add("GPEBlockChest", null, SERVER, "Removing client-only methods", removeClientOnlyMethods);
 }
+if (isBTWVersionOrNewer("4.ABBBBURNBABYBURNAHAHAHAHAHA"))
+{
+  function changeOwner(mn)
+  {
+    for (var i = 0; i < mn.instructions.size(); i++)
+    {
+      var n = mn.instructions.get(i);
+      if (isInstance(n, "org.objectweb.asm.tree.MethodInsnNode") && n.owner.equals("FCItemBlockCustom"))
+      {
+        n.owner = "xn";
+        return true;
+      }
+    }
+  }
+  tweak("GPEItemBlockMicro", null, BOTH, "<init>(I)V", CHECKSUM_IGNORE, "(1/2) Changing inheritance from removed class",
+    changeOwner);
+  tweak("GPEItemBlockMicro", null, BOTH, "a(Lwm;Lsq;Laab;IIIIFFF)Z", CHECKSUM_IGNORE, "(1/3) Changing inheritance from removed class",
+    changeOwner);
+  add("GPEItemBlockMicro", null, BOTH, "(3/3) Changing inheritance from removed class",
+  function(cn)
+  {
+    cn.superName = "xn";
+  });
+  // tweaking overrides adapting, so have to call it manually
+  add("GPEItemBlockMicro", null, SERVER, "Removing client-only methods", removeClientOnlyMethods);
+}
diff --git a/tweaksrc/GPEBTWTweak.java b/tweaksrc/GPEBTWTweak.java
index 38f568c..e802340 100644
--- a/tweaksrc/GPEBTWTweak.java
+++ b/tweaksrc/GPEBTWTweak.java
@@ -11,7 +11,7 @@ public class GPEBTWTweak extends FCAddOn
 {
   public static GPEBTWTweak instance;
   private static GPEBTWTweakProxy proxy;
-  public static final String tweakVersion = "1.1";
+  public static final String tweakVersion = "1.1a";
 
   private static boolean postPostInitialized = false;
   public static boolean isDecoPresent;
@@ -1681,37 +1681,41 @@ private static void extendBlockIDs()
     FCTileEntityBeacon.InitializeEffectsByBlockID();
   }
 
-  public static boolean canPlaceItemBlock(ItemBlock ib, World world, int x, int y, int z, int side, EntityPlayer player, ItemStack stack, float hitX, float hitY, float hitZ)
+  public static boolean canPlaceItemBlock(Item item, World world, int x, int y, int z, int side, EntityPlayer player, ItemStack stack, float hitX, float hitY, float hitZ)
   {
-    if (ib instanceof GPEItemBlockMicro)
+    if (item instanceof ItemBlock)
     {
-      GPEItemBlockMicro mi = (GPEItemBlockMicro)ib;
-      if (mi.attemptToCombineWithBlock(stack, world, x, y, z, side, hitX, hitY, hitZ, false, true))
-        return true;
+      ItemBlock ib = (ItemBlock)item;
+      if (ib instanceof GPEItemBlockMicro)
+      {
+        GPEItemBlockMicro mi = (GPEItemBlockMicro)ib;
+        if (mi.attemptToCombineWithBlock(stack, world, x, y, z, side, hitX, hitY, hitZ, false, true))
+          return true;
+      }
+      int id = ib.getBlockID();
+      int meta = ib.getMetadata(stack.getItemDamage());
+      Block block = Block.blocksList[id];
+      if (block instanceof GPEBlockLadder || block instanceof FCIBlock)
+      {
+        switch (side)
+        {
+          case 0: --y; break;
+          case 1: ++y; break;
+          case 2: --z; break;
+          case 3: ++z; break;
+          case 4: --x; break;
+          case 5: ++x; break;
+        }
+        int newMeta = block.onBlockPlaced(world, x, y, z, side, hitX, hitY, hitZ, meta);
+        GPEWorldProxy4BB wp = new GPEWorldProxy4BB(world, x, y, z, id, newMeta);
+        block.setBlockBoundsBasedOnState(wp, x, y, z);
+        AxisAlignedBB bb = AxisAlignedBB.getAABBPool().getAABB(
+          (double)x + block.minX, (double)y + block.minY, (double)z + block.minZ,
+          (double)x + block.maxX, (double)y + block.maxY, (double)z + block.maxZ);
+        return world.checkNoEntityCollision(bb);
+      }
     }
-    int id = ib.getBlockID();
-    int meta = ib.getMetadata(stack.getItemDamage());
-    Block block = Block.blocksList[id];
-    if (!(block instanceof GPEBlockLadder || block instanceof FCIBlock))
-    {
-      return ib.canPlaceItemBlockOnSide(world, x, y, z, side, player, stack);
-    }
-    switch (side)
-    {
-      case 0: --y; break;
-      case 1: ++y; break;
-      case 2: --z; break;
-      case 3: ++z; break;
-      case 4: --x; break;
-      case 5: ++x; break;
-    }
-    int newMeta = block.onBlockPlaced(world, x, y, z, side, hitX, hitY, hitZ, meta);
-    GPEWorldProxy4BB wp = new GPEWorldProxy4BB(world, x, y, z, id, newMeta);
-    block.setBlockBoundsBasedOnState(wp, x, y, z);
-    AxisAlignedBB bb = AxisAlignedBB.getAABBPool().getAABB(
-      (double)x + block.minX, (double)y + block.minY, (double)z + block.minZ,
-      (double)x + block.maxX, (double)y + block.maxY, (double)z + block.maxZ);
-    return world.checkNoEntityCollision(bb);
+    return item.CanItemBeUsedByPlayer(world, x, y, z, side, player, stack);
   }
 
   public static int getMinimumDifficulty()
diff --git a/tweaksrc/GPEItemBlockMicro.java b/tweaksrc/GPEItemBlockMicro.java
index 3008de9..3f6aa57 100644
--- a/tweaksrc/GPEItemBlockMicro.java
+++ b/tweaksrc/GPEItemBlockMicro.java
@@ -1,6 +1,6 @@
 package net.minecraft.src;
 
-public abstract class GPEItemBlockMicro extends FCItemBlockCustom
+public abstract class GPEItemBlockMicro extends FCItemBlockCustom // NOTE: change to ItemBlock if it fails to compile in newer BTW version.
 {
   public GPEItemBlockMicro(int id)
   {