diff --git a/alethzero/MainWin.cpp b/alethzero/MainWin.cpp
index 7f5847009..1036c1ea0 100644
--- a/alethzero/MainWin.cpp
+++ b/alethzero/MainWin.cpp
@@ -144,10 +144,11 @@ void Main::refresh()
 		ui->transactionQueue->clear();
 		for (pair<h256, Transaction> const& i: m_client->pending())
 		{
-			ui->transactionQueue->addItem(QString("%1 @ %2 <- %3")
-								  .arg(formatBalance(i.second.value).c_str())
-								  .arg(asHex(i.second.receiveAddress.asArray()).c_str())
-								  .arg(asHex(i.second.sender().asArray()).c_str()) );
+			ui->transactionQueue->addItem(QString("%1 [%4] @ %2 <- %3")
+								.arg(formatBalance(i.second.value).c_str())
+								.arg(asHex(i.second.receiveAddress.asArray()).c_str())
+								.arg(asHex(i.second.sender().asArray()).c_str())
+								.arg((unsigned)i.second.nonce));
 		}
 
 		ui->transactions->clear();
@@ -159,10 +160,11 @@ void Main::refresh()
 			for (auto const& i: RLP(bc.block(h))[1])
 			{
 				Transaction t(i.data());
-				ui->transactions->addItem(QString("%1 @ %2 <- %3")
-								  .arg(formatBalance(t.value).c_str())
-								  .arg(asHex(t.receiveAddress.asArray()).c_str())
-								  .arg(asHex(t.sender().asArray()).c_str()) );
+				ui->transactions->addItem(QString("%1 [%4] @ %2 <- %3")
+								.arg(formatBalance(t.value).c_str())
+								.arg(asHex(t.receiveAddress.asArray()).c_str())
+								.arg(asHex(t.sender().asArray()).c_str())
+								.arg((unsigned)t.nonce));
 			}
 		}
 	}
@@ -310,7 +312,15 @@ void Main::on_send_clicked()
 			u256s data;
 			data.reserve(m_data.size());
 			for (QString const& i: m_data)
-				data.push_back(u256(i.toStdString()));
+			{
+				u256 d = 0;
+				try
+				{
+					d = u256(i.toStdString());
+				}
+				catch (...) {}
+				data.push_back(d);
+			}
 			m_client->transact(s, r, value(), data);
 			refresh();
 			return;
diff --git a/libethereum/Client.cpp b/libethereum/Client.cpp
index a22b10498..cd0e72d87 100644
--- a/libethereum/Client.cpp
+++ b/libethereum/Client.cpp
@@ -98,15 +98,15 @@ void Client::stopMining()
 
 void Client::transact(Secret _secret, Address _dest, u256 _amount, u256s _data)
 {
-	m_lock.lock();
+	lock_guard<mutex> l(m_lock);
 	Transaction t;
-	t.nonce = m_s.transactionsFrom(toAddress(_secret));
+	cnote << "New transaction " << t;
+	t.nonce = m_mined.transactionsFrom(toAddress(_secret));
 	t.receiveAddress = _dest;
 	t.value = _amount;
 	t.data = _data;
 	t.sign(_secret);
 	m_tq.attemptImport(t.rlp());
-	m_lock.unlock();
 	m_changed = true;
 }
 
diff --git a/libethereum/PeerNetwork.cpp b/libethereum/PeerNetwork.cpp
index 77e446af8..1b1afeba3 100644
--- a/libethereum/PeerNetwork.cpp
+++ b/libethereum/PeerNetwork.cpp
@@ -70,7 +70,7 @@ bool eth::isPrivateAddress(bi::address _addressToCheck)
 	{
 		bi::address_v4 v4Address = _addressToCheck.to_v4();
 		bi::address_v4::bytes_type bytesToCheck = v4Address.to_bytes();
-		if (bytesToCheck[0] == 10)
+		if (bytesToCheck[0] == 10 || bytesToCheck[0] == 127)
 			return true;
 		if (bytesToCheck[0] == 172 && (bytesToCheck[1] >= 16 && bytesToCheck[1] <=31))
 			return true;
diff --git a/libethereum/Transaction.h b/libethereum/Transaction.h
index bacd125f8..d7029a0f2 100644
--- a/libethereum/Transaction.h
+++ b/libethereum/Transaction.h
@@ -61,6 +61,12 @@ struct Transaction
 
 using Transactions = std::vector<Transaction>;
 
+inline std::ostream& operator<<(std::ostream& _out, Transaction const& _t)
+{
+	_out << "{" << _t.receiveAddress << "/" << _t.nonce << "*" << _t.value << "}";
+	return _out;
+}
+
 }