diff --git a/lib/protocol.js b/lib/protocol.js
index b0e2e28..b9db95c 100644
--- a/lib/protocol.js
+++ b/lib/protocol.js
@@ -1090,8 +1090,8 @@ function readBool(buffer, offset) {
 function readPosition(buffer, offset) {
   var longVal = readLong(buffer, offset).value; // I wish I could do destructuring...
   var x = longVal[0] >> 6;
-  var y = ((longVal[0] & 0x3F) << 6) | (longVal[1] >> 26);
-  var z = longVal[1] << 6 >> 6
+  var y = ((longVal[0] & 0x3F) << 6) | ((longVal[1] >> 26) & 0x3f);
+  var z = longVal[1] & 0x3FFFFFF;
   return {
     value: { x: x, y: y, z: z },
     size: 8
@@ -1131,7 +1131,7 @@ function readSlot(buffer, offset) {
 }
 
 function sizeOfSlot(value) {
-  if (value.id === -1)
+  if (value.blockId === -1)
     return (2);
   else if (!value.nbtData) {
     return (6);
@@ -1142,14 +1142,14 @@ function sizeOfSlot(value) {
 
 function writePosition(value, buffer, offset) {
   var longVal = [];
-  longVal[0] = ((value.x & 0x3FFFFFF) <<  6) | ((value.y & 0xFC0) >> 6);
+  longVal[0] = ((value.x & 0x3FFFFFF) <<  6) | ((value.y & 0xFFF) >> 6);
   longVal[1] = ((value.y & 0x3F) << 26) | (value.z & 0x3FFFFFF);
   return writeLong(longVal, buffer, offset);
 }
 
 function writeSlot(value, buffer, offset) {
-  buffer.writeInt16BE(value.id, offset);
-  if (value.id === -1) return offset + 2;
+  buffer.writeInt16BE(value.blockId, offset);
+  if (value.blockId === -1) return offset + 2;
   buffer.writeInt8(value.itemCount, offset + 2);
   buffer.writeInt16BE(value.itemDamage, offset + 3);
   var nbtDataLen;
@@ -1409,13 +1409,7 @@ function read(buffer, cursor, fieldInfo, rootNodes) {
       error: new Error("missing data type: " + fieldInfo.type)
     };
   }
-  try {
   var readResults = type[0](buffer, cursor, fieldInfo.typeArgs, rootNodes);
-  } catch (e) {
-    console.log("fieldInfo : " + JSON.stringify(fieldInfo));
-    console.log("rootNodes : " + JSON.stringify(rootNodes));
-    throw e;
-  }
   if (readResults == null) {
     throw new Error("Reader returned null : " + JSON.stringify(fieldInfo));
   }