diff --git a/bitcoin-qt.pro b/bitcoin-qt.pro
index 59f7a471..4e09583c 100644
--- a/bitcoin-qt.pro
+++ b/bitcoin-qt.pro
@@ -4,6 +4,7 @@ VERSION = 0.6.0.10
 INCLUDEPATH += src src/json src/qt
 DEFINES += QT_GUI BOOST_THREAD_USE_LIB
 CONFIG += no_include_pwd
+CONFIG += thread
 
 # for boost 1.37, add -mt to the boost libraries
 # use: qmake BOOST_LIB_SUFFIX=-mt
@@ -317,6 +318,9 @@ macx:LIBS += -framework Foundation -framework ApplicationServices -framework App
 macx:DEFINES += MAC_OSX MSG_NOSIGNAL=0
 macx:ICON = src/qt/res/icons/bitcoin.icns
 macx:TARGET = "Bitcoin-Qt"
+macx:QMAKE_CFLAGS_THREAD += -pthread
+macx:QMAKE_LFLAGS_THREAD += -pthread
+macx:QMAKE_CXXFLAGS_THREAD += -pthread
 
 # Set libraries and includes at end, to use platform-defined defaults if not overridden
 INCLUDEPATH += $$BOOST_INCLUDE_PATH $$BDB_INCLUDE_PATH $$OPENSSL_INCLUDE_PATH $$QRENCODE_INCLUDE_PATH
diff --git a/src/bitcoinrpc.cpp b/src/bitcoinrpc.cpp
index 93d4d8fd..6510377f 100644
--- a/src/bitcoinrpc.cpp
+++ b/src/bitcoinrpc.cpp
@@ -1715,7 +1715,7 @@ Value encryptwallet(const Array& params, bool fHelp)
     // slack space in .dat files; that is bad if the old data is
     // unencrypted private keys.  So:
     StartShutdown();
-    return "wallet encrypted; bitcoin server stopping, restart to run with encrypted wallet";
+    return "wallet encrypted; bitcoin server stopping, restart to run with encrypted wallet.  The keypool has been flushed, you need to make a new backup.";
 }
 
 
diff --git a/src/init.cpp b/src/init.cpp
index 116f3c14..8aac160d 100644
--- a/src/init.cpp
+++ b/src/init.cpp
@@ -260,7 +260,7 @@ bool AppInit2(int argc, char* argv[])
         // On Windows, show a message box, as there is no stderr
         wxMessageBox(strUsage, "Usage");
 #else
-        fprintf(stderr, "%s", strUsage.c_str());
+        fprintf(stdout, "%s", strUsage.c_str());
 #endif
         return false;
     }
diff --git a/src/qt/askpassphrasedialog.cpp b/src/qt/askpassphrasedialog.cpp
index 2126edf0..cae021c9 100644
--- a/src/qt/askpassphrasedialog.cpp
+++ b/src/qt/askpassphrasedialog.cpp
@@ -109,7 +109,16 @@ void AskPassphraseDialog::accept()
                 if(model->setWalletEncrypted(true, newpass1))
                 {
                     QMessageBox::warning(this, tr("Wallet encrypted"),
-                                         tr("Bitcoin will close now to finish the encryption process. Remember that encrypting your wallet cannot fully protect your bitcoins from being stolen by malware infecting your computer."));
+                                         "<qt>" + 
+                                         tr("Bitcoin will close now to finish the encryption process. "
+                                         "Remember that encrypting your wallet cannot fully protect "
+                                         "your bitcoins from being stolen by malware infecting your computer.") + 
+                                         "<br><br><b>" + 
+                                         tr("IMPORTANT: Any previous backups you have made of your wallet file "
+                                         "should be replaced with the newly generated, encrypted wallet file. "
+                                         "For security reasons, previous backups of the unencrypted wallet file "
+                                         "will become useless as soon as you start using the new, encrypted wallet.") + 
+                                         "</b></qt>");
                     QApplication::quit();
                 }
                 else
diff --git a/src/qt/forms/sendcoinsdialog.ui b/src/qt/forms/sendcoinsdialog.ui
index 04cf404a..7eadec98 100644
--- a/src/qt/forms/sendcoinsdialog.ui
+++ b/src/qt/forms/sendcoinsdialog.ui
@@ -144,7 +144,7 @@
         <string>Confirm the send action</string>
        </property>
        <property name="text">
-        <string>&amp;Send</string>
+        <string>S&amp;end</string>
        </property>
        <property name="icon">
         <iconset resource="../bitcoin.qrc">
diff --git a/src/qt/transactiondesc.cpp b/src/qt/transactiondesc.cpp
index 089fe751..a91fc388 100644
--- a/src/qt/transactiondesc.cpp
+++ b/src/qt/transactiondesc.cpp
@@ -66,11 +66,10 @@ QString TransactionDesc::toHTML(CWallet *wallet, CWalletTx &wtx)
         {
             strHTML += tr("<b>Source:</b> Generated<br>");
         }
-        else if (!wtx.mapValue["from"].empty())
+        else if (wtx.mapValue.count("from") && !wtx.mapValue["from"].empty())
         {
             // Online transaction
-            if (!wtx.mapValue["from"].empty())
-                strHTML += tr("<b>From:</b> ") + GUIUtil::HtmlEscape(wtx.mapValue["from"]) + "<br>";
+            strHTML += tr("<b>From:</b> ") + GUIUtil::HtmlEscape(wtx.mapValue["from"]) + "<br>";
         }
         else
         {
@@ -107,7 +106,7 @@ QString TransactionDesc::toHTML(CWallet *wallet, CWalletTx &wtx)
         // To
         //
         string strAddress;
-        if (!wtx.mapValue["to"].empty())
+        if (wtx.mapValue.count("to") && !wtx.mapValue["to"].empty())
         {
             // Online transaction
             strAddress = wtx.mapValue["to"];
@@ -164,7 +163,7 @@ QString TransactionDesc::toHTML(CWallet *wallet, CWalletTx &wtx)
                     if (wallet->IsMine(txout))
                         continue;
 
-                    if (wtx.mapValue["to"].empty())
+                    if (!wtx.mapValue.count("to") || wtx.mapValue["to"].empty())
                     {
                         // Offline transaction
                         CBitcoinAddress address;
@@ -213,9 +212,9 @@ QString TransactionDesc::toHTML(CWallet *wallet, CWalletTx &wtx)
         //
         // Message
         //
-        if (!wtx.mapValue["message"].empty())
+        if (wtx.mapValue.count("message") && !wtx.mapValue["message"].empty())
             strHTML += QString("<br><b>") + tr("Message:") + "</b><br>" + GUIUtil::HtmlEscape(wtx.mapValue["message"], true) + "<br>";
-        if (!wtx.mapValue["comment"].empty())
+        if (wtx.mapValue.count("comment") && !wtx.mapValue["comment"].empty())
             strHTML += QString("<br><b>") + tr("Comment:") + "</b><br>" + GUIUtil::HtmlEscape(wtx.mapValue["comment"], true) + "<br>";
 
         strHTML += QString("<b>") + tr("Transaction ID:") + "</b> " + wtx.GetHash().ToString().c_str() + "<br>";
diff --git a/src/util.cpp b/src/util.cpp
index b5971ec7..9c12b156 100644
--- a/src/util.cpp
+++ b/src/util.cpp
@@ -195,8 +195,14 @@ inline int OutputDebugStringF(const char* pszFormat, ...)
         if (fileout)
         {
             static bool fStartedNewLine = true;
-            static boost::mutex mutexDebugLog;
-            boost::mutex::scoped_lock scoped_lock(mutexDebugLog);
+
+            // This routine may be called by global destructors during shutdown.
+            // Since the order of destruction of static/global objects is undefined,
+            // allocate mutexDebugLog on the heap the first time this routine
+            // is called to avoid crashes during shutdown.
+            static boost::mutex* mutexDebugLog = NULL;
+            if (mutexDebugLog == NULL) mutexDebugLog = new boost::mutex();
+            boost::mutex::scoped_lock scoped_lock(*mutexDebugLog);
 
             // Debug print useful for profiling
             if (fLogTimestamps && fStartedNewLine)