diff --git a/alethzero/MainWin.cpp b/alethzero/MainWin.cpp
index 6ab50e9d8..14d7b91eb 100644
--- a/alethzero/MainWin.cpp
+++ b/alethzero/MainWin.cpp
@@ -1390,15 +1390,22 @@ void Main::on_debugTimeline_valueChanged()
 	updateDebugger();
 }
 
-QString prettyU256(eth::u256 _n)
+QString Main::prettyU256(eth::u256 _n) const
 {
 	ostringstream s;
 	if (_n >> 32 == 0)
 		s << hex << "0x" << (unsigned)_n;
 	else if (_n >> 200 == 0)
-		s << "0x" << (h160)right160(_n);
+	{
+		Address a = right160(_n);
+		QString n = pretty(a);
+		if (n.isNull())
+			s << "0x" << a;
+		else
+			s << "<b>" << n.toHtmlEscaped().toStdString() << "</b> (" << a.abridged() << ")";
+	}
 	else if (fromRaw((h256)_n).size())
-		s << "\"" << fromRaw((h256)_n).toStdString() << "\"";
+		return "\"" + fromRaw((h256)_n).toHtmlEscaped() + "\"";
 	else
 		s << "0x" << (h256)_n;
 	return QString::fromStdString(s.str());
@@ -1458,7 +1465,7 @@ void Main::updateDebugger()
 					ostringstream out;
 					out << s.cur.abridged();
 					if (i)
-						out << " @0x" << hex << s.curPC;
+						out << " " << c_instructionInfo.at(s.inst).name << " @0x" << hex << s.curPC;
 					ui->callStack->addItem(QString::fromStdString(out.str()));
 				}
 			}
diff --git a/alethzero/MainWin.h b/alethzero/MainWin.h
index dd4001fc1..b2bda680a 100644
--- a/alethzero/MainWin.h
+++ b/alethzero/MainWin.h
@@ -140,6 +140,7 @@ private:
 	void updateBlockCount();
 
 	QString pretty(eth::Address _a) const;
+	QString prettyU256(eth::u256 _n) const;
 
 	void populateDebugger(eth::bytesConstRef r);
 	void initDebugger();
diff --git a/libethereum/State.cpp b/libethereum/State.cpp
index c3380f76a..e650469c1 100644
--- a/libethereum/State.cpp
+++ b/libethereum/State.cpp
@@ -891,7 +891,7 @@ map<u256, u256> State::storage(Address _id) const
 		// Then merge cached storage over the top.
 		for (auto const& i: it->second.storage())
 			if (i.second)
-				ret.insert(i);
+				ret[i.first] = i.second;
 			else
 				ret.erase(i.first);
 	}