diff --git a/PyMca5/PyMcaGui/io/hdf5/Hdf5NodeView.py b/PyMca5/PyMcaGui/io/hdf5/Hdf5NodeView.py
index 5f40497ad..d3913346c 100644
--- a/PyMca5/PyMcaGui/io/hdf5/Hdf5NodeView.py
+++ b/PyMca5/PyMcaGui/io/hdf5/Hdf5NodeView.py
@@ -110,6 +110,10 @@ def __init__(self, parent=None):
                     method="getPlugin2DInstance",
                     directoryList=PLUGINS_DIR)
         self._toolbar.addWidget(pluginsToolButton)
+        if hasattr(self, "getIntensityHistogramAction"):
+            self.getIntensityHistogramAction().setVisible(True)
+        else:
+            print("Plot2D getIntensityHistogramAction missing")
 
 
 class Plot2DViewWithPlugins(DataViews._Plot2dView):
@@ -117,7 +121,6 @@ def createWidget(self, parent):
         widget = Plot2DWithPlugins(parent=parent)
         widget.setDefaultColormap(self.defaultColormap())
         widget.getColormapAction().setColorDialog(self.defaultColorDialog())
-        widget.getIntensityHistogramAction().setVisible(True)
         widget.setKeepDataAspectRatio(False)
         widget.getXAxis().setLabel('X')
         widget.getYAxis().setLabel('Y')
diff --git a/PyMca5/PyMcaGui/plotting/SilxMaskImageWidget.py b/PyMca5/PyMcaGui/plotting/SilxMaskImageWidget.py
index 7f1f66cee..a61a9d05e 100644
--- a/PyMca5/PyMcaGui/plotting/SilxMaskImageWidget.py
+++ b/PyMca5/PyMcaGui/plotting/SilxMaskImageWidget.py
@@ -579,6 +579,11 @@ def __init__(self, parent=None):
                 PlotActions.ColormapAction(plot=self.plot, parent=self))
         self.addAction(self.colormapAction)
 
+        self.pixelIntensitiesHistoAction = self.group.addAction(
+                PlotActions.PixelIntensitiesHistoAction(plot=self.plot, parent=self))
+        self.addAction(self.pixelIntensitiesHistoAction)
+        self.pixelIntensitiesHistoAction.setVisible(True)
+
         self.copyAction = self.group.addAction(
                 PlotActions.CopyAction(plot=self.plot, parent=self))
         self.addAction(self.copyAction)
@@ -675,8 +680,8 @@ def _createToolBar(self, title, parent):
         index = objects.index(self.colormapAction)
         objects.insert(index + 1, self.keepDataAspectRatioButton)
         objects.insert(index + 2, self.yAxisInvertedButton)
-        objects.insert(index + 3, self.saveToolbutton)
-        objects.insert(index + 4, self.backgroundButton)
+        objects.insert(index + 4, self.saveToolbutton)
+        objects.insert(index + 5, self.backgroundButton)
         for obj in objects:
             if isinstance(obj, qt.QAction):
                 toolbar.addAction(obj)
diff --git a/PyMca5/PyMcaGui/pymca/PyMcaImageWindow.py b/PyMca5/PyMcaGui/pymca/PyMcaImageWindow.py
index e0f43c89f..ee3c156d4 100644
--- a/PyMca5/PyMcaGui/pymca/PyMcaImageWindow.py
+++ b/PyMca5/PyMcaGui/pymca/PyMcaImageWindow.py
@@ -88,7 +88,7 @@ def _addImageClicked(self):
             self._connectCorrelator()
         if self._imageData is None:
             return
-        if self._imageData == []:
+        if len(self._imageData) == 0:
             return
 
         if not RGBImageCalculator.RGBImageCalculator._addImageClicked(self):
diff --git a/PyMca5/PyMcaGui/pymca/RGBImageCalculator.py b/PyMca5/PyMcaGui/pymca/RGBImageCalculator.py
index 6f315ad83..76cd538b4 100644
--- a/PyMca5/PyMcaGui/pymca/RGBImageCalculator.py
+++ b/PyMca5/PyMcaGui/pymca/RGBImageCalculator.py
@@ -331,7 +331,7 @@ def _addImageClicked(self):
         _logger.debug("Add image clicked")
         if self._imageData is None:
             return
-        if self._imageData == []:
+        if len(self._imageData) == 0:
             return
         text = "%s" % self.name.text()
         if not len(text):