--- a/bitcoin-qt.pro
+++ b/bitcoin-qt.pro
@@ -254,6 +254,7 @@
 windows:LIBS += -lmingwthrd -lws2_32
 windows:DEFINES += _MT WIN32
 windows:RC_FILE = src/qt/res/bitcoin-qt.rc
+windows:QMAKE_LIBS_QT_ENTRY -= -lmingw32
 
 macx:HEADERS += src/qt/macdockiconhandler.h
 macx:OBJECTIVE_SOURCES += src/qt/macdockiconhandler.mm

--- a/contrib/gitian-descriptors/qt-win32.yml
+++ b/contrib/gitian-descriptors/qt-win32.yml
@@ -47,7 +47,6 @@
   cp -a bin $SRCDIR/
   cd $INSTDIR
   find . -name *.prl | xargs -l sed 's|/$||' -i
-  sed 's/QMAKE_LIBS_QT_ENTRY     = -lmingw32 -lqtmain/QMAKE_LIBS_QT_ENTRY     = -lqtmain/' -i mkspecs/unsupported/win32-g++-cross/qmake.conf
   #sed 's|QMAKE_PRL_LIBS.*|QMAKE_PRL_LIBS = -lQtDeclarative -lQtScript -lQtSvg -lQtSql -lQtXmlPatterns -lQtGui -lgdi32 -lcomdlg32 -loleaut32 -limm32 -lwinmm -lwinspool -lmsimg32 -lQtNetwork -lQtCore -lole32 -luuid -lws2_32 -ladvapi32 -lshell32 -luser32 -lkernel32|' -i imports/Qt/labs/particles/qmlparticlesplugin.prl
 
   # as zip stores file timestamps, use faketime to intercept stat calls to set dates for all files to reference date

--- a/src/bignum.h
+++ b/src/bignum.h
@@ -243,7 +243,7 @@
     std::vector<unsigned char> getvch() const
     {
         unsigned int nSize = BN_bn2mpi(this, NULL);
-        if (nSize < 4)
+        if (nSize <= 4)
             return std::vector<unsigned char>();
         std::vector<unsigned char> vch(nSize);
         BN_bn2mpi(this, &vch[0]);

--- a/src/db.cpp
+++ b/src/db.cpp
@@ -780,7 +780,10 @@
         // Get cursor
         Dbc* pcursor = GetCursor();
         if (!pcursor)
+        {
+            printf("Error getting wallet database cursor\n");
             return DB_CORRUPT;
+        }
 
         loop
         {
@@ -791,7 +794,10 @@
             if (ret == DB_NOTFOUND)
                 break;
             else if (ret != 0)
+            {
+                printf("Error reading next record from wallet database\n");
                 return DB_CORRUPT;
+            }
 
             // Unserialize
             // Taking advantage of the fact that pair serialization
@@ -861,19 +867,38 @@
                     CPrivKey pkey;
                     ssValue >> pkey;
                     key.SetPrivKey(pkey);
-                    if (key.GetPubKey() != vchPubKey || !key.IsValid())
+                    if (key.GetPubKey() != vchPubKey)
+                    {
+                        printf("Error reading wallet database: CPrivKey pubkey inconsistency\n");
                         return DB_CORRUPT;
+                    }
+                    if (!key.IsValid())
+                    {
+                        printf("Error reading wallet database: invalid CPrivKey\n");
+                        return DB_CORRUPT;
+                    }
                 }
                 else
                 {
                     CWalletKey wkey;
                     ssValue >> wkey;
                     key.SetPrivKey(wkey.vchPrivKey);
-                    if (key.GetPubKey() != vchPubKey || !key.IsValid())
+                    if (key.GetPubKey() != vchPubKey)
+                    {
+                        printf("Error reading wallet database: CWalletKey pubkey inconsistency\n");
                         return DB_CORRUPT;
+                    }
+                    if (!key.IsValid())
+                    {
+                        printf("Error reading wallet database: invalid CWalletKey\n");
+                        return DB_CORRUPT;
+                    }
                 }
                 if (!pwallet->LoadKey(key))
+                {
+                    printf("Error reading wallet database: LoadKey failed\n");
                     return DB_CORRUPT;
+                }
             }
             else if (strType == "mkey")
             {
@@ -882,7 +907,10 @@
                 CMasterKey kMasterKey;
                 ssValue >> kMasterKey;
                 if(pwallet->mapMasterKeys.count(nID) != 0)
+                {
+                    printf("Error reading wallet database: duplicate CMasterKey id %u\n", nID);
                     return DB_CORRUPT;
+                }
                 pwallet->mapMasterKeys[nID] = kMasterKey;
                 if (pwallet->nMasterKeyMaxID < nID)
                     pwallet->nMasterKeyMaxID = nID;
@@ -894,7 +922,10 @@
                 vector<unsigned char> vchPrivKey;
                 ssValue >> vchPrivKey;
                 if (!pwallet->LoadCryptedKey(vchPubKey, vchPrivKey))
+                {
+                    printf("Error reading wallet database: LoadCryptedKey failed\n");
                     return DB_CORRUPT;
+                }
                 fIsEncrypted = true;
             }
             else if (strType == "defaultkey")

--- a/src/init.cpp
+++ b/src/init.cpp
@@ -370,12 +370,14 @@
         else if (nLoadWalletRet == DB_NEED_REWRITE)
         {
             strErrors += _("Wallet needed to be rewritten: restart Bitcoin to complete    \n");
+            printf("%s", strErrors.c_str());
             wxMessageBox(strErrors, "Bitcoin", wxOK | wxICON_ERROR);
             return false;
         }
         else
             strErrors += _("Error loading wallet.dat      \n");
     }
+    printf("%s", strErrors.c_str());
     printf(" wallet      %15"PRI64d"ms\n", GetTimeMillis() - nStart);
 
     RegisterWallet(pwalletMain);

--- a/src/qt/bitcoingui.cpp
+++ b/src/qt/bitcoingui.cpp
@@ -45,6 +45,7 @@
 #include <QStackedWidget>
 #include <QDateTime>
 #include <QMovie>
+#include <QTimer>
 
 #include <QDragEnterEvent>
 #include <QUrl>
@@ -55,7 +56,6 @@
     QMainWindow(parent),
     clientModel(0),
     walletModel(0),
-    dummyWidget(0),
     encryptWalletAction(0),
     changePassphraseAction(0),
     aboutQtAction(0),
@@ -85,9 +85,6 @@
     // Create the tray icon (or setup the dock icon)
     createTrayIcon();
 
-    // Dummy widget used when restoring window state after minimization
-    dummyWidget = new QWidget();
-
     // Create tabs
     overviewPage = new OverviewPage();
 
@@ -161,7 +158,6 @@
 #ifdef Q_WS_MAC
     delete appMenuBar;
 #endif
-    delete dummyWidget;
 }
 
 void BitcoinGUI::createActions()
@@ -387,14 +383,6 @@
 }
 #endif
 
-void BitcoinGUI::showNormal()
-{
-    // Reparent window to the desktop (in case it was hidden on minimize)
-    if(parent() != NULL)
-        setParent(NULL, Qt::Window);
-    QMainWindow::showNormal();
-}
-
 void BitcoinGUI::optionsClicked()
 {
     if(!clientModel || !clientModel->getOptionsModel())
@@ -536,25 +524,21 @@
 
 void BitcoinGUI::changeEvent(QEvent *e)
 {
+    QMainWindow::changeEvent(e);
 #ifndef Q_WS_MAC // Ignored on Mac
     if(e->type() == QEvent::WindowStateChange)
     {
         if(clientModel && clientModel->getOptionsModel()->getMinimizeToTray())
         {
-            if(isMinimized())
+            QWindowStateChangeEvent *wsevt = static_cast<QWindowStateChangeEvent*>(e);
+            if(!(wsevt->oldState() & Qt::WindowMinimized) && isMinimized())
             {
-                // Hiding the window from taskbar
-                setParent(dummyWidget, Qt::SubWindow);
-                return;
-            }
-            else
-            {
-                showNormal();
+                QTimer::singleShot(0, this, SLOT(hide()));
+                e->ignore();
             }
         }
     }
 #endif
-    QMainWindow::changeEvent(e);
 }
 
 void BitcoinGUI::closeEvent(QCloseEvent *event)

--- a/src/qt/bitcoingui.h
+++ b/src/qt/bitcoingui.h
@@ -57,8 +57,6 @@
 
     QStackedWidget *centralWidget;
 
-    QWidget *dummyWidget;
-
     OverviewPage *overviewPage;
     QWidget *transactionsPage;
     AddressBookPage *addressBookPage;
@@ -126,8 +124,6 @@
     */
     void askFee(qint64 nFeeRequired, bool *payFee);
 
-    void showNormal();
-
 private slots:
     /** Switch to overview (home) page */
     void gotoOverviewPage();

--- a/src/qt/sendcoinsentry.cpp
+++ b/src/qt/sendcoinsentry.cpp
@@ -66,6 +66,7 @@
 void SendCoinsEntry::setModel(WalletModel *model)
 {
     this->model = model;
+    clear();
 }
 
 void SendCoinsEntry::setRemoveEnabled(bool enabled)