diff --git a/Network/PSKReporter.cpp b/Network/PSKReporter.cpp
index c072860f8..5543c222b 100644
--- a/Network/PSKReporter.cpp
+++ b/Network/PSKReporter.cpp
@@ -116,7 +116,7 @@ public:
 
   void handle_socket_error (QAbstractSocket::SocketError e)
   {
-    LOG_LOG_LOCATION (logger_, trace, "err: " << e);
+    LOG_LOG_LOCATION (logger_, warning, "socket error: " << socket_->errorString ());
     switch (e)
       {
       case QAbstractSocket::RemoteHostClosedError:
diff --git a/Transceiver/DXLabSuiteCommanderTransceiver.cpp b/Transceiver/DXLabSuiteCommanderTransceiver.cpp
index 7991d3e82..8dca88520 100644
--- a/Transceiver/DXLabSuiteCommanderTransceiver.cpp
+++ b/Transceiver/DXLabSuiteCommanderTransceiver.cpp
@@ -149,7 +149,7 @@ void DXLabSuiteCommanderTransceiver::do_stop ()
 
 void DXLabSuiteCommanderTransceiver::do_ptt (bool on)
 {
-  CAT_TRACE (on << state ());
+  CAT_TRACE (on << ' ' << state ());
   if (use_for_ptt_)
     {
       simple_command (on  ? "<command:5>CmdTX<parameters:0>" : "<command:5>CmdRX<parameters:0>");
@@ -204,7 +204,7 @@ void DXLabSuiteCommanderTransceiver::do_ptt (bool on)
 
 void DXLabSuiteCommanderTransceiver::do_frequency (Frequency f, MODE m, bool /*no_ignore*/)
 {
-  CAT_TRACE (f << state ());
+  CAT_TRACE (f << ' ' << state ());
   auto f_string = frequency_to_string (f);
   if (UNK != m && m != get_mode ())
     {
@@ -223,7 +223,7 @@ void DXLabSuiteCommanderTransceiver::do_frequency (Frequency f, MODE m, bool /*n
 
 void DXLabSuiteCommanderTransceiver::do_tx_frequency (Frequency tx, MODE mode, bool /*no_ignore*/)
 {
-  CAT_TRACE (tx << state ());
+  CAT_TRACE (tx << ' ' << state ());
   if (tx)
     {
       auto f_string = frequency_to_string (tx);
@@ -244,7 +244,7 @@ void DXLabSuiteCommanderTransceiver::do_tx_frequency (Frequency tx, MODE mode, b
 
 void DXLabSuiteCommanderTransceiver::do_mode (MODE m)
 {
-  CAT_TRACE (m << state ());
+  CAT_TRACE (m << ' ' << state ());
   auto m_string = map_mode (m);
   auto params =  ("<1:%1>" + m_string).arg (m_string.size ());
   simple_command (("<command:10>CmdSetMode<parameters:%1>" + params).arg (params.size ()));
@@ -444,7 +444,7 @@ QString DXLabSuiteCommanderTransceiver::command_with_reply (QString const& cmd)
   //     qDebug () << i << ":" << hex << int (result[i]);
   //   }
 
-  CAT_TRACE (cmd << "->" << QString {result});
+  CAT_TRACE (cmd << " -> " << QString {result});
   return result;                // converting raw UTF-8 bytes to QString
 }
 
diff --git a/Transceiver/Transceiver.cpp b/Transceiver/Transceiver.cpp
index e240d151f..5d97f0110 100644
--- a/Transceiver/Transceiver.cpp
+++ b/Transceiver/Transceiver.cpp
@@ -27,7 +27,7 @@ std::ostream& operator << (std::ostream& os, Transceiver::TransceiverState const
 {
   return os
     << "Transceiver::TransceiverState(online: " << (s.online_ ? "yes" : "no")
-    << " Frequency {" << s.rx_frequency_ << "Hz, " << s.tx_frequency_ << "Hz} " << s.mode_
+    << " Frequency {" << s.rx_frequency_ << "Hz, " << s.tx_frequency_ << "Hz} Mode: " << s.mode_
     << "; SPLIT: " << (Transceiver::TransceiverState::Split::on == s.split_ ? "on" : Transceiver::TransceiverState::Split::off == s.split_ ? "off" : "unknown")
     << "; PTT: " << (s.ptt_ ? "on" : "off")
     << ')';
diff --git a/WSJTXLogging.cpp b/WSJTXLogging.cpp
index e0ba871bd..d18d938ae 100644
--- a/WSJTXLogging.cpp
+++ b/WSJTXLogging.cpp
@@ -57,7 +57,7 @@ namespace
     void operator () (std::logic_error const& e) const
     {
       std::cout << "std::logic_error: " << e.what () << std::endl;
-      //throw;
+      throw;
     }
   };
 
@@ -103,11 +103,6 @@ namespace
           << boost::log::add_value ("Function", function)
           << context.category << ": " << msg.toStdWString ();
       }
-    if (QtFatalMsg == type)
-      {
-        // bail out
-        throw std::runtime_error {"Fatal Qt Error"};
-      }
   }
 }
 
diff --git a/main.cpp b/main.cpp
index c6dd0ccbf..0960789e0 100644
--- a/main.cpp
+++ b/main.cpp
@@ -5,7 +5,7 @@
 #include <iterator>
 #include <algorithm>
 #include <ios>
-#include <locale.h>
+#include <locale>
 #include <fftw3.h>
 
 #include <QSharedMemory>
@@ -115,7 +115,7 @@ int main(int argc, char *argv[])
 
   auto const env = QProcessEnvironment::systemEnvironment ();
 
-  QApplication a(argc, argv);
+  ExceptionCatchingApplication a(argc, argv);
   try
     {
       // LOG_INfO ("+++++++++++++++++++++++++++ Resources ++++++++++++++++++++++++++++");
@@ -129,10 +129,13 @@ int main(int argc, char *argv[])
       // LOG_INFO ("--------------------------- Resources ----------------------------");
 
       QLocale locale;              // get the current system locale
-      setlocale (LC_NUMERIC, "C"); // ensure number forms are in
-                                   // consistent format, do this after
-                                   // instantiating QApplication so
-                                   // that GUI has correct l18n
+
+      // Set C/C++ locale used for logging etc.
+#if defined (Q_OS_WIN)
+      std::locale::global (std::locale ("C"));
+#else
+      std::locale::global (std::locale ("en_US.UTF-8"));
+#endif
 
       // Override programs executable basename as application name.
       a.setApplicationName ("WSJT-X");
@@ -397,7 +400,7 @@ int main(int argc, char *argv[])
                                               a.translate ("main", "Unable to create shared memory segment"));
                 throw std::runtime_error {"Shared memory error"};
               }
-              LOG_INFO ("shmem size:" << mem_jt9.size ());
+              LOG_INFO ("shmem size: " << mem_jt9.size ());
             }
           else
             {
diff --git a/widgets/mainwindow.cpp b/widgets/mainwindow.cpp
index a8e83d05a..397ca12af 100644
--- a/widgets/mainwindow.cpp
+++ b/widgets/mainwindow.cpp
@@ -7215,7 +7215,12 @@ void MainWindow::rigFailure (QString const& reason)
     {
       if (m_splash && m_splash->isVisible ()) m_splash->hide ();
       m_rigErrorMessageBox.setDetailedText (reason + "\n\nTimestamp: "
-                                            + QDateTime::currentDateTimeUtc ().toString (Qt::ISODateWithMs));
+#if QT_VERSION >= QT_VERSION_CHECK (5, 8, 0)
+                                            + QDateTime::currentDateTimeUtc ().toString (Qt::ISODateWithMs)
+#else
+                                            + QDateTime::currentDateTimeUtc ().toString ("yyyy-MM-ddTHH:mm:ss.zzzZ")
+#endif
+                                            );
 
       // don't call slot functions directly to avoid recursion
       m_rigErrorMessageBox.exec ();