diff --git a/FlatCAMApp.py b/FlatCAMApp.py
index bbaad6dc..b96b7bfe 100644
--- a/FlatCAMApp.py
+++ b/FlatCAMApp.py
@@ -51,8 +51,8 @@ class App(QtCore.QObject):
 
     ## Logging ##
     log = logging.getLogger('base')
-    #log.setLevel(logging.DEBUG)
-    log.setLevel(logging.WARNING)
+    log.setLevel(logging.DEBUG)
+    #log.setLevel(logging.WARNING)
     formatter = logging.Formatter('[%(levelname)s][%(threadName)s] %(message)s')
     handler = logging.StreamHandler()
     handler.setFormatter(formatter)
@@ -690,7 +690,6 @@ class App(QtCore.QObject):
         self.defaults["def_win_w"] = width
         self.defaults["def_win_h"] = height
         self.save_defaults()
-        print self.defaults
 
     def message_dialog(self, title, message, kind="info"):
         icon = {"info": QtGui.QMessageBox.Information,
diff --git a/PlotCanvas.py b/PlotCanvas.py
index 65aad311..8e4f58d9 100644
--- a/PlotCanvas.py
+++ b/PlotCanvas.py
@@ -7,6 +7,11 @@
 ############################################################
 
 from PyQt4 import QtGui, QtCore
+
+# Prevent conflict with Qt5 and above.
+from matplotlib import use as mpl_use
+mpl_use("Qt4Agg")
+
 from matplotlib.figure import Figure
 from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg as FigureCanvas
 import FlatCAMApp
@@ -264,8 +269,8 @@ class PlotCanvas:
 
         # Adjust axes
         for ax in self.figure.get_axes():
-            ax.set_xlim((xmin + x*width, xmax + x*width))
-            ax.set_ylim((ymin + y*height, ymax + y*height))
+            ax.set_xlim((xmin + x * width, xmax + x * width))
+            ax.set_ylim((ymin + y * height, ymax + y * height))
 
         # Re-draw
         self.canvas.draw()
@@ -302,7 +307,7 @@ class PlotCanvas:
             if event.button == 'up':
                 self.zoom(1.5, self.mouse)
             else:
-                self.zoom(1/1.5, self.mouse)
+                self.zoom(1 / 1.5, self.mouse)
             return
 
         if self.key == 'shift':
diff --git a/camlib.py b/camlib.py
index 5e32eff5..cd65d388 100644
--- a/camlib.py
+++ b/camlib.py
@@ -43,8 +43,8 @@ import simplejson as json
 import logging
 
 log = logging.getLogger('base2')
-#log.setLevel(logging.DEBUG)
-log.setLevel(logging.WARNING)
+log.setLevel(logging.DEBUG)
+#log.setLevel(logging.WARNING)
 #log.setLevel(logging.INFO)
 formatter = logging.Formatter('[%(levelname)s] %(message)s')
 handler = logging.StreamHandler()