diff --git a/scripts/DAMARIS3 b/scripts/DAMARIS3
index c3397da..a5a7cd8 100755
--- a/scripts/DAMARIS3
+++ b/scripts/DAMARIS3
@@ -53,7 +53,6 @@ if args.debug:
         resource.setrlimit(resource.RLIMIT_CORE, (-1, -1))
     except ImportError:
         pass
-    matplotlib.rcParams["verbose.level"] = "debug"
 print(args)
 d = damaris.gui.DamarisGUI.DamarisGUI(args.exp_script, args.res_script, start_immediately=args.run)
 d.run()
diff --git a/src/gui/DamarisGUI.py b/src/gui/DamarisGUI.py
index 3854b6b..de6bad7 100644
--- a/src/gui/DamarisGUI.py
+++ b/src/gui/DamarisGUI.py
@@ -50,8 +50,7 @@ import numpy
 
 # math graphics
 import matplotlib
-# force noninteractive and use of numpy
-# matplotlib.rcParams["numerix"]="numpy"
+# force noninteractive
 matplotlib.rcParams[ "interactive" ] = "False"
 matplotlib.rcParams[ "text.usetex" ] = "False"
 matplotlib.rcParams[ "axes.formatter.limits" ] = "-3,3"
@@ -193,7 +192,7 @@ class DamarisGUI:
         # lock file to prevent other DAMARIS to start immediatly
         self.lockfile = LockFile()  # = os.path.expanduser("~/.damaris.lock")
         self.id = None
-        
+
         #to stop queued experiments
         self.stop_experiment_flag = threading.Event()
 
@@ -2475,9 +2474,8 @@ class MonitorWidgets:
         self.display_table.attach( self.matplot_canvas, 0, 6, 0, 1, gtk.AttachOptions.EXPAND | gtk.AttachOptions.FILL, gtk.AttachOptions.EXPAND | gtk.AttachOptions.FILL, 0, 0 )
         self.matplot_canvas.show( )
 
-        # Matplot Toolbar hinzufuegen (Display_Table, 2. Zeile) 
-        self.matplot_toolbar = matplotlib.backends.backend_gtk3.NavigationToolbar2GTK3( self.matplot_canvas,
-                                                                                      self.main_window )
+        # Matplot Toolbar hinzufuegen (Display_Table, 2. Zeile)
+        self.matplot_toolbar = matplotlib.backends.backend_gtk3.NavigationToolbar2GTK3( self.matplot_canvas )
 
         self.display_table.attach( self.matplot_toolbar, 0, 1, 1, 2, gtk.AttachOptions.FILL | gtk.AttachOptions.EXPAND, 0, 0, 0 )
         self.matplot_toolbar.show( )
@@ -2969,8 +2967,9 @@ class MonitorWidgets:
         if not hasattr( self, "graphen" ):
             self.graphen = [ ]
         elif self.graphen:
-            for l in self.graphen:
-                self.matplot_axes.lines.remove( l )
+            for line in self.graphen:
+                #self.matplot_axes.lines.remove( line )
+                line.remove()
             self.graphen = [ ]
             self.matplot_axes.clear( )
             self.matplot_axes.grid( True )
diff --git a/tests/exp_test.py b/tests/exp_test.py
index df72a6e..43e00b2 100644
--- a/tests/exp_test.py
+++ b/tests/exp_test.py
@@ -7,5 +7,5 @@ def test():
     return e
 
 def experiment():
-    for i in range(100):
+    for i in range(10):
         yield test()
\ No newline at end of file