diff --git a/chain/block_manager.go b/chain/block_manager.go
index c1a28e423..9133475b6 100644
--- a/chain/block_manager.go
+++ b/chain/block_manager.go
@@ -185,8 +185,7 @@ func (sm *BlockManager) Process(block *Block) (td *big.Int, msgs state.Messages,
 	defer sm.mutex.Unlock()
 
 	if sm.bc.HasBlock(block.Hash()) {
-		fmt.Println("already having this block")
-		return nil, nil, nil
+		return nil, nil, &KnownBlockError{block.Number, block.Hash()}
 	}
 
 	if !sm.bc.HasBlock(block.PrevHash) {
@@ -233,12 +232,10 @@ func (sm *BlockManager) ProcessWithParent(block, parent *Block) (td *big.Int, me
 
 	// Block validation
 	if err = sm.ValidateBlock(block, parent); err != nil {
-		statelogger.Errorln("validating block:", err)
 		return
 	}
 
 	if err = sm.AccumelateRewards(state, block, parent); err != nil {
-		statelogger.Errorln("accumulating reward", err)
 		return
 	}
 
@@ -271,7 +268,6 @@ func (sm *BlockManager) ProcessWithParent(block, parent *Block) (td *big.Int, me
 		sm.transState = state.Copy()
 
 		sm.eth.TxPool().RemoveSet(block.Transactions())
-		fmt.Println("TD", td)
 
 		return td, messages, nil
 	} else {
diff --git a/chain/chain_manager.go b/chain/chain_manager.go
index 3448b02dd..45af61e48 100644
--- a/chain/chain_manager.go
+++ b/chain/chain_manager.go
@@ -330,10 +330,10 @@ func (self *ChainManager) InsertChain(chain Blocks) error {
 				continue
 			}
 
+			chainlogger.Infof("block process failed %v (%x)\n", block.Number, block.Hash()[:4])
 			return err
 		}
 
-		fmt.Println(td, messages, err)
 		self.add(block)
 		self.SetTotalDifficulty(td)
 		self.Ethereum.EventMux().Post(NewBlockEvent{block})
diff --git a/chain/error.go b/chain/error.go
index 7dce2b608..0c4d6e59e 100644
--- a/chain/error.go
+++ b/chain/error.go
@@ -128,12 +128,12 @@ func IsTDError(e error) bool {
 }
 
 type KnownBlockError struct {
-	number uint64
+	number *big.Int
 	hash   []byte
 }
 
 func (self *KnownBlockError) Error() string {
-	return fmt.Sprintf("block %d already known (%x)", self.number, self.hash[0:4])
+	return fmt.Sprintf("block %v already known (%x)", self.number, self.hash[0:4])
 }
 func IsKnownBlockErr(e error) bool {
 	_, ok := e.(*KnownBlockError)
diff --git a/cmd/mist/assets/qml/views/miner.qml b/cmd/mist/assets/qml/views/miner.qml
index 2d59bb3a4..e0182649f 100644
--- a/cmd/mist/assets/qml/views/miner.qml
+++ b/cmd/mist/assets/qml/views/miner.qml
@@ -119,12 +119,14 @@ Rectangle {
 						}
 					}
 					Component.onCompleted: {
+						/*
 						// XXX Temp. replace with above eventually
 						var tmpItems = ["JEVCoin", "Some coin", "Other coin", "Etc coin"];
 						var address = "e6716f9544a56c530d868e4bfbacb172315bdead";
 						for (var i = 0; i < tmpItems.length; i++) {
 							mergedMiningModel.append({checked: false, name: tmpItems[i], address: address, id: 0, itemId: i});
 						}
+						*/
 					}
 				}
 			}