diff --git a/libtorrent/include/libtorrent/udp_socket.hpp b/libtorrent/include/libtorrent/udp_socket.hpp
index dc257f806..dab9941e5 100644
--- a/libtorrent/include/libtorrent/udp_socket.hpp
+++ b/libtorrent/include/libtorrent/udp_socket.hpp
@@ -65,7 +65,13 @@ namespace libtorrent
 		proxy_settings const& get_proxy_settings() { return m_proxy_settings; }
 
 #ifdef TORRENT_DEBUG
-		~udp_socket() { m_magic = 0; }
+		~udp_socket()
+		{
+			TORRENT_ASSERT(m_magic == 0x1337);
+			TORRENT_ASSERT(m_outstanding == 0);
+			TORRENT_ASSERT(!m_callback);
+			m_magic = 0;
+		}
 #endif
 
 	private:
diff --git a/libtorrent/include/libtorrent/version.hpp b/libtorrent/include/libtorrent/version.hpp
index 8a02b90ec..ac6cadf3a 100644
--- a/libtorrent/include/libtorrent/version.hpp
+++ b/libtorrent/include/libtorrent/version.hpp
@@ -36,6 +36,6 @@ POSSIBILITY OF SUCH DAMAGE.
 #define LIBTORRENT_VERSION_MAJOR 0
 #define LIBTORRENT_VERSION_MINOR 14
 
-#define LIBTORRENT_VERSION "0.14.1.0"
+#define LIBTORRENT_VERSION "0.14.2.0"
 
 #endif
diff --git a/libtorrent/src/storage.cpp b/libtorrent/src/storage.cpp
index fc491c98f..82402629f 100755
--- a/libtorrent/src/storage.cpp
+++ b/libtorrent/src/storage.cpp
@@ -1942,6 +1942,8 @@ namespace libtorrent
 	// is finished
 	int piece_manager::check_files(int& current_slot, int& have_piece, std::string& error)
 	{
+		if (m_state == state_none) return check_no_fastresume(error);
+
 		TORRENT_ASSERT(int(m_piece_to_slot.size()) == m_files.num_pieces());
 
 		current_slot = m_current_slot;
diff --git a/libtorrent/src/torrent_info.cpp b/libtorrent/src/torrent_info.cpp
index 5f5b8fd76..bcfa67a35 100755
--- a/libtorrent/src/torrent_info.cpp
+++ b/libtorrent/src/torrent_info.cpp
@@ -497,20 +497,23 @@ namespace libtorrent
 				}
 			}
 
-			// shuffle each tier
-			std::vector<announce_entry>::iterator start = m_urls.begin();
-			std::vector<announce_entry>::iterator stop;
-			int current_tier = m_urls.front().tier;
-			for (stop = m_urls.begin(); stop != m_urls.end(); ++stop)
+			if (!m_urls.empty())
 			{
-				if (stop->tier != current_tier)
+				// shuffle each tier
+				std::vector<announce_entry>::iterator start = m_urls.begin();
+				std::vector<announce_entry>::iterator stop;
+				int current_tier = m_urls.front().tier;
+				for (stop = m_urls.begin(); stop != m_urls.end(); ++stop)
 				{
-					std::random_shuffle(start, stop);
-					start = stop;
-					current_tier = stop->tier;
+					if (stop->tier != current_tier)
+					{
+						std::random_shuffle(start, stop);
+						start = stop;
+						current_tier = stop->tier;
+					}
 				}
+				std::random_shuffle(start, stop);
 			}
-			std::random_shuffle(start, stop);
 		}
 		
 
diff --git a/libtorrent/src/udp_socket.cpp b/libtorrent/src/udp_socket.cpp
index e66adf1b5..8ffbe2ed8 100644
--- a/libtorrent/src/udp_socket.cpp
+++ b/libtorrent/src/udp_socket.cpp
@@ -45,6 +45,7 @@ udp_socket::udp_socket(asio::io_service& ios, udp_socket::callback_t const& c
 void udp_socket::send(udp::endpoint const& ep, char const* p, int len, error_code& ec)
 {
 	CHECK_MAGIC;
+	TORRENT_ASSERT(m_ipv4_sock.is_open());
 	if (m_tunnel_packets)
 	{
 		// send udp packets through SOCKS5 server
@@ -72,8 +73,8 @@ void udp_socket::on_read(udp::socket* s, error_code const& e, std::size_t bytes_
 		{
 			// "this" may be destructed in the callback
 			// that's why we need to unlock
-			l.unlock();
 			callback_t tmp = m_callback;
+			l.unlock();
 			m_callback.clear();
 		}
 		return;
@@ -84,6 +85,7 @@ void udp_socket::on_read(udp::socket* s, error_code const& e, std::size_t bytes_
 
 	if (e)
 	{
+		l.unlock();
 #ifndef BOOST_NO_EXCEPTIONS
 		try {
 #endif
@@ -94,6 +96,7 @@ void udp_socket::on_read(udp::socket* s, error_code const& e, std::size_t bytes_
 #ifndef BOOST_NO_EXCEPTIONS
 		} catch(std::exception&) {}
 #endif
+		l.lock();
 
 		// don't stop listening on recoverable errors
 		if (e != asio::error::host_unreachable
@@ -122,9 +125,16 @@ void udp_socket::on_read(udp::socket* s, error_code const& e, std::size_t bytes_
 #endif
 
 		if (m_tunnel_packets && m_v4_ep == m_proxy_addr)
+		{
+			l.unlock();
 			unwrap(e, m_v4_buf, bytes_transferred);
+		}
 		else
+		{
+			l.unlock();
 			m_callback(e, m_v4_ep, m_v4_buf, bytes_transferred);
+		}
+		l.lock();
 
 #ifndef BOOST_NO_EXCEPTIONS
 		} catch(std::exception&) {}
@@ -139,13 +149,20 @@ void udp_socket::on_read(udp::socket* s, error_code const& e, std::size_t bytes_
 #endif
 
 		if (m_tunnel_packets && m_v6_ep == m_proxy_addr)
+		{
+			l.unlock();
 			unwrap(e, m_v6_buf, bytes_transferred);
+		}
 		else
+		{
+			l.unlock();
 			m_callback(e, m_v6_ep, m_v6_buf, bytes_transferred);
+		}
 
 #ifndef BOOST_NO_EXCEPTIONS
 		} catch(std::exception&) {}
 #endif
+		l.lock();
 		s->async_receive_from(asio::buffer(m_v6_buf, sizeof(m_v6_buf))
 			, m_v6_ep, boost::bind(&udp_socket::on_read, this, s, _1, _2));
 	}
@@ -215,6 +232,7 @@ void udp_socket::unwrap(error_code const& e, char const* buf, int size)
 
 void udp_socket::close()
 {
+	mutex_t::scoped_lock l(m_mutex);	
 	TORRENT_ASSERT(m_magic == 0x1337);
 
 	error_code ec;
@@ -232,6 +250,7 @@ void udp_socket::close()
 		// "this" may be destructed in the callback
 		callback_t tmp = m_callback;
 		m_callback.clear();
+		l.unlock();
 	}
 }