diff --git a/.idea/misc.xml b/.idea/misc.xml
index 115f7fd..dd09d79 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -1,4 +1,4 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
-  <component name="ProjectRootManager" version="2" project-jdk-name="Python 3.9 (ravenlog) (2)" project-jdk-type="Python SDK" />
+  <component name="ProjectRootManager" version="2" project-jdk-name="Python 3.10 (ravenlog)" project-jdk-type="Python SDK" />
 </project>
\ No newline at end of file
diff --git a/.idea/ravenlog.iml b/.idea/ravenlog.iml
index 59bbe69..a3cf086 100644
--- a/.idea/ravenlog.iml
+++ b/.idea/ravenlog.iml
@@ -4,8 +4,9 @@
     <content url="file://$MODULE_DIR$">
       <excludeFolder url="file://$MODULE_DIR$/venv" />
       <excludeFolder url="file://$MODULE_DIR$/venv39" />
+      <excludeFolder url="file://$MODULE_DIR$/venv310" />
     </content>
-    <orderEntry type="jdk" jdkName="Python 3.9 (ravenlog) (2)" jdkType="Python SDK" />
+    <orderEntry type="jdk" jdkName="Python 3.10 (ravenlog)" jdkType="Python SDK" />
     <orderEntry type="sourceFolder" forTests="false" />
   </component>
 </module>
\ No newline at end of file
diff --git a/bigtext.py b/bigtext.py
index 79276d3..57ea5f3 100644
--- a/bigtext.py
+++ b/bigtext.py
@@ -58,6 +58,7 @@ class FileWatchdogThread(QRunnable):
 
     def destruct(self):
         self.observer.stop()
+        #self.observer.join(1)
 
 
 class BigText(QWidget):
@@ -97,6 +98,7 @@ class BigText(QWidget):
 
     def destruct(self):
         self.watchdog.destruct()
+        pass
 
 
 class InnerBigText(QWidget):
@@ -261,7 +263,7 @@ class InnerBigText(QWidget):
         if self.longest_line < length:
             self.longest_line = length
             maximum = max(0, length - width_in_chars + 1)
-            self.parent.h_scroll_bar.setMaximum(maximum)
+            self.parent.h_scroll_bar.setMaximum(round(maximum))
 
     def y_pos_to_line(self, y: int) -> int:
         return int(y / self.char_height)
@@ -345,7 +347,9 @@ class InnerBigText(QWidget):
         # print("paintEvent")
         painter = QPainter(self)
         # painter.setFont(self.model.settings.font())
-        painter.setFont(QFont("monospace", self.model.settings.getint_session('general', "font_size")))
+        #print("%s" %  QFontDatabase.families())
+        # Courier New, DejaVu Sans Mono
+        painter.setFont(QFont("Courier New", self.model.settings.getint_session('general', "font_size")))
         painter.setPen(QColor(0, 0, 0))
         self.update_font_metrics(painter)
 
@@ -382,7 +386,7 @@ class InnerBigText(QWidget):
             self.draw_highlights(highlight_ranges, painter, y_line_offset)
             y_line_offset = y_line_offset + self.char_height
 
-        left_offset = -1 * self._left_offset * self.char_width
+        left_offset = int(-1 * self._left_offset * self.char_width)
         y_line_offset = self.char_height;
         for l in self.lines:
             painter.drawText(left_offset, y_line_offset, l.line())
@@ -398,7 +402,7 @@ class InnerBigText(QWidget):
                 y1 = y_line_offset - self.char_height + self.char_height / 7
                 height = self.char_height
                 full_width = Settings.max_line_length() * self.char_width
-                rect = QRect(left_offset, y1, full_width, height)
+                rect = QRect(round(left_offset), round(y1), round(full_width), round(height))
                 self.highlight_background(painter, rect, highlight.get_brush_full_line())
 
         for highlight in highlights:
@@ -408,7 +412,7 @@ class InnerBigText(QWidget):
             y1 = y_line_offset - self.char_height + self.char_height / 7
             height = self.char_height
 
-            rect = QRect(left_offset + x1, y1, width, height)
+            rect = QRect(round(left_offset + x1), round(y1), round(width), round(height))
             self.highlight_background(painter, rect, highlight.get_brush())
 
     def highlight_background(self, painter: QPainter, rect: QRect, brush: QBrush):
diff --git a/filterwidget.py b/filterwidget.py
index 5d013c0..3df21c3 100644
--- a/filterwidget.py
+++ b/filterwidget.py
@@ -104,7 +104,8 @@ class FilterWidget(QWidget):
         filter_bar.layout.addWidget(self.ignore_case)
         filter_bar.layout.addWidget(self.is_regex)
 
-        (_handle, self.tmpfilename) = tempfile.mkstemp()
+        (handle, self.tmpfilename) = tempfile.mkstemp()
+        os.close(handle)
         self.filter_model = LogFileModel(self.tmpfilename, self.source_model.settings)
         self.hits_view = BigText(self.filter_model)
 
diff --git a/highlightingdialog.py b/highlightingdialog.py
index 2f06b55..e151d6e 100644
--- a/highlightingdialog.py
+++ b/highlightingdialog.py
@@ -89,7 +89,6 @@ class HighlightingDialog(QDialog):
         self._load_existing_hightlighters()
         self.list.setCurrentItem(None)
         self._selection_changed()
-        self.list.currentItemChanged.connect(self._item_changed)
         self.list.itemSelectionChanged.connect(self._selection_changed)
 
     def _add(self):
diff --git a/main.py b/main.py
index 3f4b06e..95e9ac5 100644
--- a/main.py
+++ b/main.py
@@ -61,7 +61,8 @@ class MainWindow(QMainWindow):
         open_file.setShortcut('Ctrl+O')
         open_file.triggered.connect(self._open_file_dialog)
 
-        close_action = QAction(QIcon.fromTheme("exit"), self.tr("E&xit", "menu item to close the application"), self)
+        # Linux: QIcon.fromTheme("exit")
+        close_action = QAction(QIcon.fromTheme("close"), self.tr("E&xit", "menu item to close the application"), self)
         close_action.setShortcut('Ctrl+X')
         close_action.triggered.connect(self.destruct)
 
@@ -206,10 +207,11 @@ if __name__ == "__main__":
     window = MainWindow()
     RavenUI.window = window
     window.show()
-    window.open_file("/home/andi/ws/performanceDb/data/production/logs_2018-09-06_2018-09-06.csv")
-    window.open_file("/home/andi/ws/performanceDb/data/production/vapbdcom.csv")
-    window.open_file("/var/log/syslog")
-    window.open_file("/home/andi/ws/ravenlog/example.log")
+    #window.open_file("/home/andi/ws/performanceDb/data/production/logs_2018-09-06_2018-09-06.csv")
+    #window.open_file("/home/andi/ws/performanceDb/data/production/vapbdcom.csv")
+    #window.open_file("/var/log/syslog")
+    #window.open_file("/home/andi/ws/ravenlog/example.log")
+    window.open_file("C:\\Users\\andi\\ws\\some.log")
 
     signal.signal(signal.SIGINT, stop_signal)
     signal.signal(signal.SIGTERM, stop_signal)