diff --git a/cmd/mist/assets/debugger/debugger.qml b/cmd/mist/assets/debugger/debugger.qml
index b30d20e6b..5566e8fca 100644
--- a/cmd/mist/assets/debugger/debugger.qml
+++ b/cmd/mist/assets/debugger/debugger.qml
@@ -19,7 +19,7 @@ ApplicationWindow {
     property alias dataText: rawDataField.text
 
     onClosing: {
-        dbg.Stop()
+        //dbg.Stop()
     }
 
     menuBar: MenuBar {
@@ -353,6 +353,7 @@ ApplicationWindow {
 
 
         ComboBox {
+		visible: false
             id: snippets
             anchors.right: parent.right
             model: ListModel {
diff --git a/cmd/mist/debugger.go b/cmd/mist/debugger.go
index 9df140ab1..58d8da7b2 100644
--- a/cmd/mist/debugger.go
+++ b/cmd/mist/debugger.go
@@ -267,6 +267,9 @@ type storeVal struct {
 	Key, Value string
 }
 
+func (self *Debugger) Step(evm vm.VirtualMachine, op vm.OpCode, mem *vm.Memory, stack *vm.Stack, context *vm.Context) {
+}
+
 func (self *Debugger) BreakHook(pc int, op vm.OpCode, mem *vm.Memory, stack *vm.Stack, stateObject *state.StateObject) bool {
 	self.main.Logln("break on instr:", pc)
 
diff --git a/cmd/mist/ui_lib.go b/cmd/mist/ui_lib.go
index f3559183e..c88c4dab6 100644
--- a/cmd/mist/ui_lib.go
+++ b/cmd/mist/ui_lib.go
@@ -212,16 +212,16 @@ func (self *UiLib) StartDbWithContractAndData(contractHash, data string) {
 	dbWindow := NewDebuggerWindow(self)
 	object := self.eth.ChainManager().State().GetStateObject(ethutil.Hex2Bytes(contractHash))
 	if len(object.Code) > 0 {
-		dbWindow.SetCode("0x" + ethutil.Bytes2Hex(object.Code))
+		dbWindow.SetCode(ethutil.Bytes2Hex(object.Code))
 	}
-	dbWindow.SetData("0x" + data)
+	dbWindow.SetData(data)
 
 	dbWindow.Show()
 }
 
 func (self *UiLib) StartDbWithCode(code string) {
 	dbWindow := NewDebuggerWindow(self)
-	dbWindow.SetCode("0x" + code)
+	dbWindow.SetCode(code)
 	dbWindow.Show()
 }
 
diff --git a/core/execution.go b/core/execution.go
index f1e6f83f5..cad4e84aa 100644
--- a/core/execution.go
+++ b/core/execution.go
@@ -33,7 +33,7 @@ func (self *Execution) Call(codeAddr []byte, caller vm.ContextRef) ([]byte, erro
 
 func (self *Execution) exec(code, contextAddr []byte, caller vm.ContextRef) (ret []byte, err error) {
 	env := self.env
-	evm := vm.New(env, vm.StdVmTy)
+	evm := vm.New(env)
 
 	if env.Depth() == vm.MaxCallDepth {
 		caller.ReturnGas(self.Gas, self.price)
diff --git a/vm/vm.go b/vm/vm.go
index 6aa39797e..37e4249f5 100644
--- a/vm/vm.go
+++ b/vm/vm.go
@@ -17,7 +17,6 @@ type Vm struct {
 
 	err error
 
-	// Debugging
 	Dbg Debugger
 
 	BreakPoints []int64
@@ -27,7 +26,7 @@ type Vm struct {
 	Recoverable bool
 }
 
-func NewVm(env Environment) *Vm {
+func New(env Environment) *Vm {
 	lt := LogTyPretty
 	if ethutil.Config.Diff {
 		lt = LogTyDiff
@@ -111,6 +110,9 @@ func (self *Vm) Run(me, caller ContextRef, code []byte, value, gas, price *big.I
 		op = context.GetOp(pc)
 
 		self.Printf("(pc) %-3d -o- %-14s (m) %-4d (s) %-4d ", pc, op.String(), mem.Len(), stack.Len())
+		if self.Dbg != nil {
+			//self.Dbg.Step(self, op, mem, stack, context)
+		}
 
 		newMemSize, gas := self.calculateGasAndSize(context, caller, op, statedb, mem, stack)
 
diff --git a/vm/vm_jit.go b/vm/vm_jit.go
index 1cb9652af..0882bcf0c 100644
--- a/vm/vm_jit.go
+++ b/vm/vm_jit.go
@@ -8,7 +8,7 @@ type JitVm struct {
 }
 
 func NewJitVm(env Environment) *JitVm {
-	backupVm := NewVm(env)
+	backupVm := New(env)
 	return &JitVm{env: env, backup: backupVm}
 }