diff --git a/src/main/java/me/cortex/voxy/client/core/VoxyRenderSystem.java b/src/main/java/me/cortex/voxy/client/core/VoxyRenderSystem.java
index 6b591d7a..ecf1be1f 100644
--- a/src/main/java/me/cortex/voxy/client/core/VoxyRenderSystem.java
+++ b/src/main/java/me/cortex/voxy/client/core/VoxyRenderSystem.java
@@ -61,10 +61,18 @@ public class VoxyRenderSystem {
         this.worldIn = world;
         this.renderer = new RenderService(world, threadPool);
         this.postProcessing = new PostProcessing();
+        int minSec = MinecraftClient.getInstance().world.getBottomSectionCoord()>>5;
+        int maxSec = (MinecraftClient.getInstance().world.getTopSectionCoord()-1)>>5;
+
+        //Do some very cheeky stuff for MiB
+        if (false) {
+            minSec = -8;
+            maxSec = 7;
+        }
 
         this.renderDistanceTracker = new RenderDistanceTracker(20,
-                MinecraftClient.getInstance().world.getBottomSectionCoord()>>5,
-                (MinecraftClient.getInstance().world.getTopSectionCoord()-1)>>5,
+                minSec,
+                maxSec,
                 this.renderer::addTopLevelNode,
                 this.renderer::removeTopLevelNode);
 
@@ -160,6 +168,7 @@ public class VoxyRenderSystem {
             cameraX -= sector<<14;//10+4
             cameraY += (16+(256-32-sector*30))*16;
         }
+
         long startTime = System.nanoTime();
         TimingStatistics.all.start();
         TimingStatistics.main.start();
diff --git a/src/main/java/me/cortex/voxy/client/core/rendering/hierachical/NodeManager.java b/src/main/java/me/cortex/voxy/client/core/rendering/hierachical/NodeManager.java
index a11d14e3..1ac9c880 100644
--- a/src/main/java/me/cortex/voxy/client/core/rendering/hierachical/NodeManager.java
+++ b/src/main/java/me/cortex/voxy/client/core/rendering/hierachical/NodeManager.java
@@ -123,7 +123,27 @@ public class NodeManager {
         this.geometryManager = geometryManager;
     }
 
+    private static void assertPosValid(long pos) {
+        int lvl = WorldEngine.getLevel(pos);
+        int x = WorldEngine.getX(pos);
+        int y = WorldEngine.getY(pos);
+        int z = WorldEngine.getZ(pos);
+        if (WorldEngine.getWorldSectionId(lvl, x, y, z) != pos) {
+            throw new IllegalStateException("Reconstructed pos not same as original");
+        }
+        x <<= lvl;
+        y <<= lvl;
+        z <<= lvl;
+        long p2 = WorldEngine.getWorldSectionId(0, x, y, z);
+        if (WorldEngine.getLevel(p2) != 0 || WorldEngine.getX(p2) != x || WorldEngine.getY(p2) != y || WorldEngine.getZ(p2) != z) {
+            throw new IllegalStateException("Position not valid at all levels");
+        }
+    }
+
     public void insertTopLevelNode(long pos) {
+        //Verify that pos is actually valid
+        assertPosValid(pos);
+
         if ((pos&0xF) != 0) {
             throw new IllegalStateException("BAD POS !! YOU DID SOMETHING VERY BAD");
         }
@@ -399,7 +419,7 @@ public class NodeManager {
             // so add the new nodes to it
             int requestId = this.nodeData.getNodeRequest(nodeId);
             var request = this.childRequests.get(requestId);// TODO: do not assume request is childRequest (it will probably always be)
-            if (request.getPosition() != pos) throw new IllegalStateException("Request is not at pos");
+            if (request.getPosition() != pos) throw new IllegalStateException("Request is not at pos: got " + WorldEngine.pprintPos(pos) + " expected: " + WorldEngine.pprintPos(request.getPosition()));
 
             //Add all new children to the request
             for (int i = 0; i < 8; i++) {
diff --git a/src/main/java/me/cortex/voxy/client/core/rendering/hierachical/TestNodeManager.java b/src/main/java/me/cortex/voxy/client/core/rendering/hierachical/TestNodeManager.java
index aa2219c4..1e57dc94 100644
--- a/src/main/java/me/cortex/voxy/client/core/rendering/hierachical/TestNodeManager.java
+++ b/src/main/java/me/cortex/voxy/client/core/rendering/hierachical/TestNodeManager.java
@@ -277,7 +277,7 @@ public class TestNodeManager {
     public static void main(String[] args) {
         Logger.INSERT_CLASS = false;
         int ITER_COUNT = 5_000;
-        int INNER_ITER_COUNT = 100_000;
+        int INNER_ITER_COUNT = 1_000_000;
         boolean GEO_REM = true;
 
         AtomicInteger finished = new AtomicInteger();
@@ -285,7 +285,7 @@ public class TestNodeManager {
 
         Logger.SHUTUP = true;
 
-        if (false) {
+        if (true) {
             for (int q = 0; q < ITER_COUNT; q++) {
                 //Logger.info("Iteration "+ q);
                 if (runTest(INNER_ITER_COUNT, q, seenTraces, GEO_REM)) {
@@ -331,8 +331,9 @@ public class TestNodeManager {
             //Fuzzy bruteforce everything
             for (int x = -R; x<=R; x++) {
                 for (int z = -R; z<=R; z++) {
-                    tops.add(WorldEngine.getWorldSectionId(4, x, 0, z));
-                    tops.add(WorldEngine.getWorldSectionId(4, x, 1, z));
+                    for (int y = -8; y<=7; y++) {
+                        tops.add(WorldEngine.getWorldSectionId(4, x, y, z));
+                    }
                 }
             }
 
@@ -351,7 +352,7 @@ public class TestNodeManager {
                 boolean addRemTLN = r.nextInt(64) == 0;
                 boolean extraBool = r.nextBoolean();
                 if (op == 0 && addRemTLN) {
-                    pos = WorldEngine.getWorldSectionId(4, r.nextInt(5)-2, r.nextInt(5)-2, r.nextInt(5)-2);
+                    pos = WorldEngine.getWorldSectionId(4, r.nextInt(5)-2, r.nextInt(32)-16, r.nextInt(5)-2);
                     boolean cont = tops.contains(pos);
                     if (cont&&extraBool&&tops.size()>1) {
                         extraBool = true;