diff --git a/PyLoT.py b/PyLoT.py
index 6b1d9d8a..ac7bcf67 100755
--- a/PyLoT.py
+++ b/PyLoT.py
@@ -254,7 +254,7 @@ class MainWindow(QMainWindow):
             self._inputs.export2File(infile)
         self.infile = infile
 
-    def setupUi(self):
+    def setupUi(self, use_logwidget=True):
         try:
             self.startTime = min(
                 [tr.stats.starttime for tr in self.data.wfdata])
@@ -731,10 +731,14 @@ class MainWindow(QMainWindow):
         _widget.setLayout(self._main_layout)
         _widget.showFullScreen()
 
-        self.logwidget = LogWidget(parent=None)
-        self.logwidget.show()
-        sys.stdout = self.logwidget.stdout
-        sys.stderr = self.logwidget.stderr
+        if use_logwidget:
+            self.logwidget = LogWidget(parent=None)
+            self.logwidget.show()
+            self.stdout = self.logwidget.stdout
+            self.stderr = self.logwidget.stderr
+
+            sys.stdout = self.stdout
+            sys.stderr = self.stderr
 
         self.setCentralWidget(_widget)
 
diff --git a/pylot/core/util/thread.py b/pylot/core/util/thread.py
index d1821884..9aac2d3b 100644
--- a/pylot/core/util/thread.py
+++ b/pylot/core/util/thread.py
@@ -22,9 +22,11 @@ class Thread(QThread):
         self.abortButton = abortButton
         self.finished.connect(self.hideProgressbar)
         self.showProgressbar()
+        self.old_stdout = None
 
     def run(self):
         if self.redirect_stdout:
+            self.old_stdout = sys.stdout
             sys.stdout = self
         try:
             if self.arg is not None:
@@ -39,7 +41,7 @@ class Thread(QThread):
             exctype, value = sys.exc_info()[:2]
             self._executedErrorInfo = '{} {} {}'. \
                 format(exctype, value, traceback.format_exc())
-        sys.stdout = sys.__stdout__
+        sys.stdout = self.old_stdout
 
     def showProgressbar(self):
         if self.progressText:
@@ -96,10 +98,12 @@ class Worker(QRunnable):
         self.progressText = progressText
         self.pb_widget = pb_widget
         self.redirect_stdout = redirect_stdout
+        self.old_stdout = None
 
     @Slot()
     def run(self):
         if self.redirect_stdout:
+            self.old_stdout = sys.stdout
             sys.stdout = self
 
         try:
@@ -112,7 +116,7 @@ class Worker(QRunnable):
             self.signals.result.emit(result)
         finally:
             self.signals.finished.emit('Done')
-        sys.stdout = sys.__stdout__
+        sys.stdout = self.old_stdout
 
     def write(self, text):
         self.signals.message.emit(text)
@@ -144,11 +148,13 @@ class MultiThread(QThread):
         self.progressText = progressText
         self.pb_widget = pb_widget
         self.redirect_stdout = redirect_stdout
+        self.old_stdout = None
         self.finished.connect(self.hideProgressbar)
         self.showProgressbar()
 
     def run(self):
         if self.redirect_stdout:
+            self.old_stdout = sys.stdout
             sys.stdout = self
         try:
             if not self.ncores:
@@ -164,7 +170,7 @@ class MultiThread(QThread):
             exc_type, exc_obj, exc_tb = sys.exc_info()
             fname = os.path.split(exc_tb.tb_frame.f_code.co_filename)[1]
             print('Exception: {}, file: {}, line: {}'.format(exc_type, fname, exc_tb.tb_lineno))
-        sys.stdout = sys.__stdout__
+        sys.stdout = self.old_stdout
 
     def showProgressbar(self):
         if self.progressText: