diff --git a/bukkit/src/main/java/com/boydti/fawe/bukkit/v1_12/BukkitQueue_1_12.java b/bukkit/src/main/java/com/boydti/fawe/bukkit/v1_12/BukkitQueue_1_12.java
index 186c48c1..7c6f3822 100644
--- a/bukkit/src/main/java/com/boydti/fawe/bukkit/v1_12/BukkitQueue_1_12.java
+++ b/bukkit/src/main/java/com/boydti/fawe/bukkit/v1_12/BukkitQueue_1_12.java
@@ -25,6 +25,7 @@ import java.io.File;
 import java.io.IOException;
 import java.lang.reflect.Constructor;
 import java.lang.reflect.Field;
+import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Method;
 import java.util.Arrays;
 import java.util.Collection;
@@ -90,6 +91,7 @@ public class BukkitQueue_1_12 extends BukkitQueue_0<net.minecraft.server.v1_12_R
     protected static Field fieldSize;
     protected static Method getEntitySlices;
     protected static Method methodTileEntityLoad;
+    protected static Method methodSaveChunk;
     protected static Field fieldTickingBlockCount;
     protected static Field fieldNonEmptyBlockCount;
     protected static Field fieldSection;
@@ -102,6 +104,7 @@ public class BukkitQueue_1_12 extends BukkitQueue_0<net.minecraft.server.v1_12_R
     protected static Field fieldGenLayer2;
     protected static Field fieldChunks;
     protected static Field fieldChunkLoader;
+    private static Field fieldSave;
     protected static MutableGenLayer genLayer;
     protected static ChunkSection emptySection;
 
@@ -133,6 +136,8 @@ public class BukkitQueue_1_12 extends BukkitQueue_0<net.minecraft.server.v1_12_R
             fieldGenLayer1.setAccessible(true);
             fieldGenLayer2.setAccessible(true);
 
+            fieldSave = ReflectionUtils.setAccessible(net.minecraft.server.v1_12_R1.Chunk.class.getDeclaredField("s"));
+
             fieldChunks = ChunkProviderServer.class.getDeclaredField("chunks");
             fieldChunkLoader = ChunkProviderServer.class.getDeclaredField("chunkLoader");
             fieldChunks.setAccessible(true);
@@ -166,6 +171,9 @@ public class BukkitQueue_1_12 extends BukkitQueue_0<net.minecraft.server.v1_12_R
         } catch (Throwable e) {
             e.printStackTrace();
         }
+        try {
+            methodSaveChunk = ChunkProviderServer.class.getDeclaredMethod("saveChunk", net.minecraft.server.v1_12_R1.Chunk.class, boolean.class);
+        } catch (NoSuchMethodError | NoSuchMethodException ignore) { }
     }
 
     public BukkitQueue_1_12(final com.sk89q.worldedit.world.World world) {
@@ -178,6 +186,25 @@ public class BukkitQueue_1_12 extends BukkitQueue_0<net.minecraft.server.v1_12_R
         getImpWorld();
     }
 
+    private boolean save(net.minecraft.server.v1_12_R1.Chunk chunk, ChunkProviderServer cps) {
+        try {
+            if (!(boolean) fieldSave.get(chunk)) return false;
+            if (methodSaveChunk != null) {
+
+                methodSaveChunk.invoke(cps, chunk, false);
+            } else {
+                cps.saveChunk(chunk);
+            }
+            cps.saveChunkNOP(chunk);
+            return true;
+        } catch (InvocationTargetException e) {
+            e.printStackTrace();
+        } catch (IllegalAccessException e) {
+            e.printStackTrace();
+        }
+        return false;
+    }
+
     @Override
     public ChunkSection[] getSections(net.minecraft.server.v1_12_R1.Chunk chunk) {
         return chunk.getSections();
@@ -287,11 +314,7 @@ public class BukkitQueue_1_12 extends BukkitQueue_0<net.minecraft.server.v1_12_R
                                 boolean isIn = allowed.isInChunk(chunk.locX, chunk.locZ);
                                 if (isIn) {
                                     if (!load) {
-                                        if (chunk.a(false)) {
-                                            mustSave = true;
-                                            provider.saveChunk(chunk);
-                                            provider.saveChunkNOP(chunk);
-                                        }
+                                        mustSave |= save(chunk, provider);
                                         continue;
                                     }
                                     iter.remove();
diff --git a/core/src/main/java/com/boydti/fawe/jnbt/CorruptSchematicStreamer.java b/core/src/main/java/com/boydti/fawe/jnbt/CorruptSchematicStreamer.java
index bb3bd7b9..f5480722 100644
--- a/core/src/main/java/com/boydti/fawe/jnbt/CorruptSchematicStreamer.java
+++ b/core/src/main/java/com/boydti/fawe/jnbt/CorruptSchematicStreamer.java
@@ -176,16 +176,17 @@ public class CorruptSchematicStreamer {
                     }
                 }
             });
-            match("Add", new CorruptSchematicStreamer.CorruptReader() {
+            match("AddBlocks", new CorruptSchematicStreamer.CorruptReader() {
                 @Override
                 public void run(DataInputStream in) throws IOException {
                     int length = in.readInt();
                     int expected = volume.get();
                     if (expected == 0) {
-                        volume.set(length * 2);
+                        expected = length * 2;
+                        volume.set(expected);
                     }
                     setupClipboard();
-                    if (expected != length) {
+                    if (expected == length * 2) {
                         for (int i = 0; i < length; i++) {
                             int value = in.read();
                             int first = value & 0x0F;
@@ -202,7 +203,7 @@ public class CorruptSchematicStreamer {
                     }
                 }
             });
-            match("Blocks", new CorruptSchematicStreamer.CorruptReader() {
+            match("Biomes", new CorruptSchematicStreamer.CorruptReader() {
                 @Override
                 public void run(DataInputStream in) throws IOException {
                     int length = in.readInt();
diff --git a/core/src/main/java/com/boydti/fawe/object/brush/CatenaryBrush.java b/core/src/main/java/com/boydti/fawe/object/brush/CatenaryBrush.java
index eab281fd..db2a144f 100644
--- a/core/src/main/java/com/boydti/fawe/object/brush/CatenaryBrush.java
+++ b/core/src/main/java/com/boydti/fawe/object/brush/CatenaryBrush.java
@@ -52,23 +52,20 @@ public class CatenaryBrush implements Brush, ResettableTool {
         return true;
     }
 
-    public Vector getVertex(Vector pos1, Vector pos2, double lenPercent) {
-        double len = pos1.distance(pos2) * lenPercent;
-
+    public static Vector getVertex(Vector pos1, Vector pos2, double lenPercent) {
+        if (lenPercent <= 1) return Vector.getMidpoint(pos1, pos2);
+        double curveLen = pos1.distance(pos2) * lenPercent;
         double dy = pos2.getY() - pos1.getY();
         double dx = pos2.getX() - pos1.getX();
         double dz = pos2.getZ() - pos1.getZ();
-        double h = Math.sqrt(dx * dx + dz * dz);
-
-        double t = Math.sqrt(len * len - dy * dy) / h;
-        double z = 0.001;
-        for (; Math.sinh(z) < t*z; z += 0.001); // close enough
-
-        double a = (h / 2) / z;
-        double p = (h - a * Math.log((len + dy) / (len - dy)))/2;
-        double q = (dy - len * Math.cosh(z) / Math.sinh(z)) / 2;
-        double y = a * 1 + q;
-
-        return pos1.add(pos2.subtract(pos1).multiply(p / h).add(0, y, 0)).round();
+        double dh = Math.sqrt(dx * dx + dz * dz);
+        double g = Math.sqrt(curveLen * curveLen - dy * dy) / 2;
+        double a = 0.00001;
+        for (;g < a * Math.sinh(dh/(2 * a)); a *= 1.00001);
+        double vertX = (dh-a*Math.log((curveLen + dy)/(curveLen - dy)))/2.0;
+        double z = (dh/2)/a;
+        double oY = (dy - curveLen * (Math.cosh(z) / Math.sinh(z))) / 2;
+        double vertY = a * 1 + oY;
+        return pos1.add(pos2.subtract(pos1).multiply(vertX / dh).add(0, vertY, 0)).round();
     }
 }
diff --git a/favs/src/main/java/com/thevoxelbox/voxelsniper/Sniper.java b/favs/src/main/java/com/thevoxelbox/voxelsniper/Sniper.java
index 21f68170..56ed07a3 100644
--- a/favs/src/main/java/com/thevoxelbox/voxelsniper/Sniper.java
+++ b/favs/src/main/java/com/thevoxelbox/voxelsniper/Sniper.java
@@ -169,6 +169,10 @@ public class Sniper {
 
         FaweQueue baseQueue = FaweAPI.createQueue(fp.getLocation().world, false);
         RegionWrapper[] mask = WEManager.IMP.getMask(fp);
+        if (mask.length == 0) {
+            BBC.NO_REGION.send(fp);
+            return false;
+        }
         MaskedFaweQueue maskQueue = new MaskedFaweQueue(baseQueue, mask);
         com.sk89q.worldedit.world.World worldEditWorld = fp.getWorld();
         FaweChangeSet changeSet = FaweChangeSet.getDefaultChangeSet(worldEditWorld, fp.getUUID());