diff --git a/src/qt/addresstablemodel.cpp b/src/qt/addresstablemodel.cpp
index dfbd445ce..8d5284d5e 100644
--- a/src/qt/addresstablemodel.cpp
+++ b/src/qt/addresstablemodel.cpp
@@ -114,7 +114,7 @@ public:
         case CT_NEW:
             if(inModel)
             {
-                qDebug() << "AddressTablePriv::updateEntry : Warning: Got CT_NEW, but entry is already in model";
+                qWarning() << "AddressTablePriv::updateEntry : Warning: Got CT_NEW, but entry is already in model";
                 break;
             }
             parent->beginInsertRows(QModelIndex(), lowerIndex, lowerIndex);
@@ -124,7 +124,7 @@ public:
         case CT_UPDATED:
             if(!inModel)
             {
-                qDebug() << "AddressTablePriv::updateEntry : Warning: Got CT_UPDATED, but entry is not in model";
+                qWarning() << "AddressTablePriv::updateEntry : Warning: Got CT_UPDATED, but entry is not in model";
                 break;
             }
             lower->type = newEntryType;
@@ -134,7 +134,7 @@ public:
         case CT_DELETED:
             if(!inModel)
             {
-                qDebug() << "AddressTablePriv::updateEntry : Warning: Got CT_DELETED, but entry is not in model";
+                qWarning() << "AddressTablePriv::updateEntry : Warning: Got CT_DELETED, but entry is not in model";
                 break;
             }
             parent->beginRemoveRows(QModelIndex(), lowerIndex, upperIndex-1);
diff --git a/src/qt/bitcoin.cpp b/src/qt/bitcoin.cpp
index 89305e9f3..569facb49 100644
--- a/src/qt/bitcoin.cpp
+++ b/src/qt/bitcoin.cpp
@@ -126,15 +126,15 @@ static void initTranslations(QTranslator &qtTranslatorBase, QTranslator &qtTrans
 #if QT_VERSION < 0x050000
 void DebugMessageHandler(QtMsgType type, const char *msg)
 {
-    Q_UNUSED(type);
-    LogPrint("qt", "GUI: %s\n", msg);
+    const char *category = (type == QtDebugMsg) ? "qt" : NULL;
+    LogPrint(category, "GUI: %s\n", msg);
 }
 #else
 void DebugMessageHandler(QtMsgType type, const QMessageLogContext& context, const QString &msg)
 {
-    Q_UNUSED(type);
     Q_UNUSED(context);
-    LogPrint("qt", "GUI: %s\n", qPrintable(msg));
+    const char *category = (type == QtDebugMsg) ? "qt" : NULL;
+    LogPrint(category, "GUI: %s\n", QString::toStdString(msg));
 }
 #endif
 
diff --git a/src/qt/paymentrequestplus.cpp b/src/qt/paymentrequestplus.cpp
index 464f995eb..acce42e20 100644
--- a/src/qt/paymentrequestplus.cpp
+++ b/src/qt/paymentrequestplus.cpp
@@ -29,18 +29,18 @@ bool PaymentRequestPlus::parse(const QByteArray& data)
 {
     bool parseOK = paymentRequest.ParseFromArray(data.data(), data.size());
     if (!parseOK) {
-        qDebug() << "PaymentRequestPlus::parse : Error parsing payment request";
+        qWarning() << "PaymentRequestPlus::parse : Error parsing payment request";
         return false;
     }
     if (paymentRequest.payment_details_version() > 1) {
-        qDebug() << "PaymentRequestPlus::parse : Received up-version payment details, version=" << paymentRequest.payment_details_version();
+        qWarning() << "PaymentRequestPlus::parse : Received up-version payment details, version=" << paymentRequest.payment_details_version();
         return false;
     }
 
     parseOK = details.ParseFromString(paymentRequest.serialized_payment_details());
     if (!parseOK)
     {
-        qDebug() << "PaymentRequestPlus::parse : Error parsing payment details";
+        qWarning() << "PaymentRequestPlus::parse : Error parsing payment details";
         paymentRequest.Clear();
         return false;
     }
@@ -80,17 +80,17 @@ bool PaymentRequestPlus::getMerchant(X509_STORE* certStore, QString& merchant) c
         digestAlgorithm = EVP_sha1();
     }
     else if (paymentRequest.pki_type() == "none") {
-        qDebug() << "PaymentRequestPlus::getMerchant : Payment request: pki_type == none";
+        qWarning() << "PaymentRequestPlus::getMerchant : Payment request: pki_type == none";
         return false;
     }
     else {
-        qDebug() << "PaymentRequestPlus::getMerchant : Payment request: unknown pki_type " << QString::fromStdString(paymentRequest.pki_type());
+        qWarning() << "PaymentRequestPlus::getMerchant : Payment request: unknown pki_type " << QString::fromStdString(paymentRequest.pki_type());
         return false;
     }
 
     payments::X509Certificates certChain;
     if (!certChain.ParseFromString(paymentRequest.pki_data())) {
-        qDebug() << "PaymentRequestPlus::getMerchant : Payment request: error parsing pki_data";
+        qWarning() << "PaymentRequestPlus::getMerchant : Payment request: error parsing pki_data";
         return false;
     }
 
@@ -100,12 +100,12 @@ bool PaymentRequestPlus::getMerchant(X509_STORE* certStore, QString& merchant) c
         QByteArray certData(certChain.certificate(i).data(), certChain.certificate(i).size());
         QSslCertificate qCert(certData, QSsl::Der);
         if (currentTime < qCert.effectiveDate() || currentTime > qCert.expiryDate()) {
-            qDebug() << "PaymentRequestPlus::getMerchant : Payment request: certificate expired or not yet active: " << qCert;
+            qWarning() << "PaymentRequestPlus::getMerchant : Payment request: certificate expired or not yet active: " << qCert;
             return false;
         }
 #if QT_VERSION >= 0x050000
         if (qCert.isBlacklisted()) {
-            qDebug() << "PaymentRequestPlus::getMerchant : Payment request: certificate blacklisted: " << qCert;
+            qWarning() << "PaymentRequestPlus::getMerchant : Payment request: certificate blacklisted: " << qCert;
             return false;
         }
 #endif
@@ -115,7 +115,7 @@ bool PaymentRequestPlus::getMerchant(X509_STORE* certStore, QString& merchant) c
             certs.push_back(cert);
     }
     if (certs.empty()) {
-        qDebug() << "PaymentRequestPlus::getMerchant : Payment request: empty certificate chain";
+        qWarning() << "PaymentRequestPlus::getMerchant : Payment request: empty certificate chain";
         return false;
     }
 
@@ -131,7 +131,7 @@ bool PaymentRequestPlus::getMerchant(X509_STORE* certStore, QString& merchant) c
     // load the signing cert into it and verify.
     X509_STORE_CTX *store_ctx = X509_STORE_CTX_new();
     if (!store_ctx) {
-        qDebug() << "PaymentRequestPlus::getMerchant : Payment request: error creating X509_STORE_CTX";
+        qWarning() << "PaymentRequestPlus::getMerchant : Payment request: error creating X509_STORE_CTX";
         return false;
     }
 
@@ -183,7 +183,7 @@ bool PaymentRequestPlus::getMerchant(X509_STORE* certStore, QString& merchant) c
     catch (SSLVerifyError& err)
     {
         fResult = false;
-        qDebug() << "PaymentRequestPlus::getMerchant : SSL error: " << err.what();
+        qWarning() << "PaymentRequestPlus::getMerchant : SSL error: " << err.what();
     }
 
     if (website)
diff --git a/src/qt/paymentserver.cpp b/src/qt/paymentserver.cpp
index fbb11617f..2049d6507 100644
--- a/src/qt/paymentserver.cpp
+++ b/src/qt/paymentserver.cpp
@@ -90,7 +90,7 @@ static QList<QString> savedPaymentRequests;
 
 static void ReportInvalidCertificate(const QSslCertificate& cert)
 {
-    qDebug() << "ReportInvalidCertificate : Payment server found an invalid certificate: " << cert.subjectInfo(QSslCertificate::CommonName);
+    qWarning() << "ReportInvalidCertificate : Payment server found an invalid certificate: " << cert.subjectInfo(QSslCertificate::CommonName);
 }
 
 //
@@ -161,7 +161,7 @@ void PaymentServer::LoadRootCAs(X509_STORE* _store)
             continue;
         }
     }
-    qDebug() << "PaymentServer::LoadRootCAs : Loaded " << nRootCerts << " root certificates";
+    qWarning() << "PaymentServer::LoadRootCAs : Loaded " << nRootCerts << " root certificates";
 
     // Project for another day:
     // Fetch certificate revocation lists, and add them to certStore.
@@ -223,7 +223,7 @@ bool PaymentServer::ipcParseCommandLine(int argc, char* argv[])
         {
             // Printing to debug.log is about the best we can do here, the
             // GUI hasn't started yet so we can't pop up a message box.
-            qDebug() << "PaymentServer::ipcSendCommandLine : Payment request file does not exist: " << arg;
+            qWarning() << "PaymentServer::ipcSendCommandLine : Payment request file does not exist: " << arg;
         }
     }
     return true;
@@ -403,7 +403,7 @@ void PaymentServer::handleURIOrFile(const QString& s)
             }
             else
             {
-                qDebug() << "PaymentServer::handleURIOrFile : Invalid URL: " << fetchUrl;
+                qWarning() << "PaymentServer::handleURIOrFile : Invalid URL: " << fetchUrl;
                 emit message(tr("URI handling"),
                     tr("Payment request fetch URL is invalid: %1").arg(fetchUrl.toString()),
                     CClientUIInterface::ICON_WARNING);
@@ -476,13 +476,13 @@ bool PaymentServer::readPaymentRequest(const QString& filename, PaymentRequestPl
     QFile f(filename);
     if (!f.open(QIODevice::ReadOnly))
     {
-        qDebug() << "PaymentServer::readPaymentRequest : Failed to open " << filename;
+        qWarning() << "PaymentServer::readPaymentRequest : Failed to open " << filename;
         return false;
     }
 
     if (f.size() > MAX_PAYMENT_REQUEST_SIZE)
     {
-        qDebug() << "PaymentServer::readPaymentRequest : " << filename << " too large";
+        qWarning() << "PaymentServer::readPaymentRequest : " << filename << " too large";
         return false;
     }
 
@@ -624,7 +624,7 @@ void PaymentServer::fetchPaymentACK(CWallet* wallet, SendCoinsRecipient recipien
         else {
             // This should never happen, because sending coins should have
             // just unlocked the wallet and refilled the keypool.
-            qDebug() << "PaymentServer::fetchPaymentACK : Error getting refund key, refund_to not set";
+            qWarning() << "PaymentServer::fetchPaymentACK : Error getting refund key, refund_to not set";
         }
     }
 
@@ -636,7 +636,7 @@ void PaymentServer::fetchPaymentACK(CWallet* wallet, SendCoinsRecipient recipien
     }
     else {
         // This should never happen, either.
-        qDebug() << "PaymentServer::fetchPaymentACK : Error serializing payment message";
+        qWarning() << "PaymentServer::fetchPaymentACK : Error serializing payment message";
     }
 }
 
@@ -649,7 +649,7 @@ void PaymentServer::netRequestFinished(QNetworkReply* reply)
             .arg(reply->request().url().toString())
             .arg(reply->errorString());
 
-        qDebug() << "PaymentServer::netRequestFinished : " << msg;
+        qWarning() << "PaymentServer::netRequestFinished : " << msg;
         emit message(tr("Payment request error"), msg, CClientUIInterface::MSG_ERROR);
         return;
     }
@@ -663,7 +663,7 @@ void PaymentServer::netRequestFinished(QNetworkReply* reply)
         SendCoinsRecipient recipient;
         if (!request.parse(data))
         {
-            qDebug() << "PaymentServer::netRequestFinished : Error parsing payment request";
+            qWarning() << "PaymentServer::netRequestFinished : Error parsing payment request";
             emit message(tr("Payment request error"),
                 tr("Payment request can not be parsed!"),
                 CClientUIInterface::MSG_ERROR);
@@ -681,7 +681,7 @@ void PaymentServer::netRequestFinished(QNetworkReply* reply)
             QString msg = tr("Bad response from server %1")
                 .arg(reply->request().url().toString());
 
-            qDebug() << "PaymentServer::netRequestFinished : " << msg;
+            qWarning() << "PaymentServer::netRequestFinished : " << msg;
             emit message(tr("Payment request error"), msg, CClientUIInterface::MSG_ERROR);
         }
         else
@@ -697,7 +697,7 @@ void PaymentServer::reportSslErrors(QNetworkReply* reply, const QList<QSslError>
 
     QString errString;
     foreach (const QSslError& err, errs) {
-        qDebug() << "PaymentServer::reportSslErrors : " << err;
+        qWarning() << "PaymentServer::reportSslErrors : " << err;
         errString += err.errorString() + "\n";
     }
     emit message(tr("Network request error"), errString, CClientUIInterface::MSG_ERROR);
diff --git a/src/qt/transactiontablemodel.cpp b/src/qt/transactiontablemodel.cpp
index d7f4c043c..a93575224 100644
--- a/src/qt/transactiontablemodel.cpp
+++ b/src/qt/transactiontablemodel.cpp
@@ -130,12 +130,12 @@ public:
             case CT_NEW:
                 if(inModel)
                 {
-                    qDebug() << "TransactionTablePriv::updateWallet : Warning: Got CT_NEW, but transaction is already in model";
+                    qWarning() << "TransactionTablePriv::updateWallet : Warning: Got CT_NEW, but transaction is already in model";
                     break;
                 }
                 if(!inWallet)
                 {
-                    qDebug() << "TransactionTablePriv::updateWallet : Warning: Got CT_NEW, but transaction is not in wallet";
+                    qWarning() << "TransactionTablePriv::updateWallet : Warning: Got CT_NEW, but transaction is not in wallet";
                     break;
                 }
                 if(showTransaction)
@@ -159,7 +159,7 @@ public:
             case CT_DELETED:
                 if(!inModel)
                 {
-                    qDebug() << "TransactionTablePriv::updateWallet : Warning: Got CT_DELETED, but transaction is not in model";
+                    qWarning() << "TransactionTablePriv::updateWallet : Warning: Got CT_DELETED, but transaction is not in model";
                     break;
                 }
                 // Removed -- remove entire transaction from table
diff --git a/src/qt/winshutdownmonitor.cpp b/src/qt/winshutdownmonitor.cpp
index b7526f0ae..f8f9bf45b 100644
--- a/src/qt/winshutdownmonitor.cpp
+++ b/src/qt/winshutdownmonitor.cpp
@@ -45,13 +45,13 @@ void WinShutdownMonitor::registerShutdownBlockReason(const QString& strReason, c
     typedef BOOL (WINAPI *PSHUTDOWNBRCREATE)(HWND, LPCWSTR);
     PSHUTDOWNBRCREATE shutdownBRCreate = (PSHUTDOWNBRCREATE)GetProcAddress(GetModuleHandleA("User32.dll"), "ShutdownBlockReasonCreate");
     if (shutdownBRCreate == NULL) {
-        qDebug() << "registerShutdownBlockReason : GetProcAddress for ShutdownBlockReasonCreate failed";
+        qWarning() << "registerShutdownBlockReason : GetProcAddress for ShutdownBlockReasonCreate failed";
         return;
     }
 
     if (shutdownBRCreate(mainWinId, strReason.toStdWString().c_str()))
-        qDebug() << "registerShutdownBlockReason : Successfully registered: " + strReason;
+        qWarning() << "registerShutdownBlockReason : Successfully registered: " + strReason;
     else
-        qDebug() << "registerShutdownBlockReason : Failed to register: " + strReason;
+        qWarning() << "registerShutdownBlockReason : Failed to register: " + strReason;
 }
 #endif