diff --git a/ethcore/Cargo.toml b/ethcore/Cargo.toml
index ef8111272..92236bd93 100644
--- a/ethcore/Cargo.toml
+++ b/ethcore/Cargo.toml
@@ -26,5 +26,5 @@ lazy_static = "0.1"
 
 [features]
 jit = ["evmjit"]
-evm_debug = []
+evm-debug = []
 test-heavy = []
diff --git a/ethcore/src/evm/interpreter.rs b/ethcore/src/evm/interpreter.rs
index 7657b1bbe..f55b94adb 100644
--- a/ethcore/src/evm/interpreter.rs
+++ b/ethcore/src/evm/interpreter.rs
@@ -791,23 +791,30 @@ impl Interpreter {
 		Ok(InstructionResult::Ok)
 	}
 
-	fn copy_data_to_memory(&self,
-						   mem: &mut Memory,
-						   stack: &mut Stack<U256>,
-						   data: &[u8]) {
-		let offset = stack.pop_back();
-		let index = stack.pop_back();
+	fn copy_data_to_memory(&self, mem: &mut Memory, stack: &mut Stack<U256>, data: &[u8]) {
+		let dest_offset = stack.pop_back();
+		let source_offset = stack.pop_back();
 		let size = stack.pop_back();
-		let data_size = data.len();
+		let source_size = U256::from(data.len());
 
-		if index < U256::from(data_size) {
-			let u_index = index.low_u64() as usize;
-			let bound_size = match size + index > U256::from(data_size) {
-				true => data_size,
-				false => size.low_u64() as usize + u_index
-			};
+		let output_end = match source_offset > source_size || size > source_size || source_offset + size > source_size {
+			true => {
+				let zero_slice = if source_offset > source_size {
+					mem.writeable_slice(dest_offset, size)
+				} else {
+					mem.writeable_slice(dest_offset + source_size - source_offset, source_offset + size - source_size)
+				};
+				for i in zero_slice.iter_mut() {
+					*i = 0;
+				}
+				data.len()
+			},
+			false => (size.low_u64() + source_offset.low_u64()) as usize
+		};
 
-			mem.write_slice(offset, &data[u_index..bound_size]);
+		if source_offset < source_size {
+			let output_begin = source_offset.low_u64() as usize;
+			mem.write_slice(dest_offset, &data[output_begin..output_end]);
 		}
 	}
 
diff --git a/ethcore/src/tests/state.rs b/ethcore/src/tests/state.rs
index 1956ed91f..a39953199 100644
--- a/ethcore/src/tests/state.rs
+++ b/ethcore/src/tests/state.rs
@@ -84,7 +84,7 @@ pub fn json_chain_test(json_data: &[u8], era: ChainEra) -> Vec<String> {
 
 declare_test!{StateTests_stBlockHashTest, "StateTests/stBlockHashTest"}
 declare_test!{StateTests_stCallCodes, "StateTests/stCallCodes"}
-//declare_test!{StateTests_stCallCreateCallCodeTest, "StateTests/stCallCreateCallCodeTest"}
+declare_test!{StateTests_stCallCreateCallCodeTest, "StateTests/stCallCreateCallCodeTest"}
 declare_test!{StateTests_stDelegatecallTest, "StateTests/stDelegatecallTest"}
 declare_test!{StateTests_stExample, "StateTests/stExample"}
 declare_test!{StateTests_stInitCodeTest, "StateTests/stInitCodeTest"}
@@ -297,7 +297,8 @@ declare_test!{StateTests_RandomTests_st201503181357CPPJIT, "StateTests/RandomTes
 declare_test!{StateTests_RandomTests_st201503181358CPPJIT, "StateTests/RandomTests/st201503181358CPPJIT"}
 declare_test!{StateTests_RandomTests_st201503181358GO, "StateTests/RandomTests/st201503181358GO"}
 declare_test!{StateTests_RandomTests_st201503181359GO, "StateTests/RandomTests/st201503181359GO"}
-//declare_test!{StateTests_RandomTests_st201503181402CPPJIT, "StateTests/RandomTests/st201503181402CPPJIT"}
+declare_test!{StateTests_RandomTests_st201503181402CPPJIT, "StateTests/RandomTests/st201503181402CPPJIT"}
+// ^^^ BROKEN ^^^
 declare_test!{StateTests_RandomTests_st201503181403GO, "StateTests/RandomTests/st201503181403GO"}
 declare_test!{StateTests_RandomTests_st201503181406CPPJIT, "StateTests/RandomTests/st201503181406CPPJIT"}
 declare_test!{StateTests_RandomTests_st201503181406GO, "StateTests/RandomTests/st201503181406GO"}
@@ -569,7 +570,8 @@ declare_test!{StateTests_RandomTests_st201503181929GO, "StateTests/RandomTests/s
 declare_test!{StateTests_RandomTests_st201503181931CPPJIT, "StateTests/RandomTests/st201503181931CPPJIT"}
 declare_test!{StateTests_RandomTests_st201503181931GO, "StateTests/RandomTests/st201503181931GO"}
 declare_test!{StateTests_RandomTests_st201503181931PYTHON, "StateTests/RandomTests/st201503181931PYTHON"}
-//declare_test!{StateTests_RandomTests_st201503191646GO, "StateTests/RandomTests/st201503191646GO"}
+declare_test!{StateTests_RandomTests_st201503191646GO, "StateTests/RandomTests/st201503191646GO"}
+// ^^^ BROKEN ^^^
 declare_test!{StateTests_RandomTests_st201503200837JS, "StateTests/RandomTests/st201503200837JS"}
 declare_test!{StateTests_RandomTests_st201503200838JS, "StateTests/RandomTests/st201503200838JS"}
 declare_test!{StateTests_RandomTests_st201503200841JS, "StateTests/RandomTests/st201503200841JS"}