diff --git a/docs/changes.md b/docs/changes.md
index 69a096eb..49eab757 100644
--- a/docs/changes.md
+++ b/docs/changes.md
@@ -1,5 +1,6 @@
 ## Main changes
 
+
 - general improvements to the `vedo` command line
 - `colorcet` [colormaps](https://colorcet.holoviz.org) are directly usable in `vedo`.
 Check example `basic/mesh_custom.py`
@@ -14,9 +15,10 @@ Check example `basic/mesh_custom.py`
 `vedo --info some_image.jpg https://vedo.embl.es/examples/data/porsche.ply`
 
 - pressing `shift-A` toggles antialiasing for the whole rendering window
-- pressing `shift-D` toggles depth-peeling algorithm (to visualize transparent object)
+- pressing `shift-D` toggles depth-peeling algorithm for the current renderer
 
 - antialiasing set by default on vtk9
+- balloon-style flags are disabled  because of a bug in vtk9.
 
 ---
 ### `base.py`
@@ -26,8 +28,8 @@ Check example `basic/mesh_custom.py`
 ### `addons.py`
 - added `addSplineTool()` to interactively spline points in space
 - added `labelRotation` in addScalarBar3D
-- added `xAxisRotation` to rotate the whole axis (ticks and labels)
 - added `xShiftAlongY` keywords in `Axes` to slide the whole axis position along another axis
+- added `xAxisRotation` to rotate the whole axis (ticks and labels)
 - `addScalarBar3D()` can now render categorical data
 
 ---
@@ -57,9 +59,6 @@ Check example `basic/mesh_custom.py`
 ### `pointcloud.py`
 - added `cutWithBox()`, `cutWithLine()`, `cutWithSphere()` and `cutWithCylinder()` methods
 
----
-### `pyplot.py`
-
 ---
 ### `shapes.py`
 - fixed small bug in `Glyph`
diff --git a/examples/advanced/timer_callback2.py b/examples/advanced/timer_callback2.py
index 1f14593a..a25a135c 100644
--- a/examples/advanced/timer_callback2.py
+++ b/examples/advanced/timer_callback2.py
@@ -23,8 +23,8 @@ def initialize(self):
         return self
 
     def show(self, *args, **kwargs):
-        self.plotter.show(*args, **kwargs)
-        return self
+        plt = self.plotter.show(*args, **kwargs)
+        return plt
 
     def _buttonfunc(self):
         if self.timerId is not None:
diff --git a/examples/basic/colorcubes.py b/examples/basic/colorcubes.py
index 51a784c1..ae09bd2f 100644
--- a/examples/basic/colorcubes.py
+++ b/examples/basic/colorcubes.py
@@ -1,6 +1,6 @@
 """Show a cube for each available color name"""
 print(__doc__)
-from vedo import Cube, Text2D, show, settings, interactive
+from vedo import Cube, Text2D, show, settings
 from vedo.colors import colors
 from operator import itemgetter
 
@@ -17,6 +17,7 @@
     cbs.append([tname, cb])
 print("click on any cube and press i or I")
 plt1= show(cbs, N=len(cbs), azimuth=.2, size='full', title="matplotlib colors", interactive=0)
+plt1.render()
 
 # sort by name (bootstrap5 colors):
 sorted_colors2 = sorted(colors.items(), key=itemgetter(0))
@@ -28,6 +29,5 @@
     cbs.append([cname, cb])
 plt2= show(cbs, shape=(11,9), azimuth=.2, size=(800,1000), title="bootstrap5 colors", new=True)
 
-interactive()
-plt1.close()
 plt2.close()
+plt1.close()
diff --git a/examples/pyplot/customAxes3.py b/examples/pyplot/customAxes3.py
index 62ab409c..c0101016 100644
--- a/examples/pyplot/customAxes3.py
+++ b/examples/pyplot/customAxes3.py
@@ -22,6 +22,6 @@
            xyShift=0.2,  # move xy plane 20% along z
            yzShift=0.2,  # move yz plane 20% along x
            zxShift=0.2,  # move zx plane 20% along y
-          )
+)
 
 show(sph, axs, __doc__).close()
diff --git a/vedo/plotter.py b/vedo/plotter.py
index 81e09a81..2f9f52c8 100644
--- a/vedo/plotter.py
+++ b/vedo/plotter.py
@@ -2577,7 +2577,7 @@ def _keypress(self, iren, event):
             self.escaped = True # window will be escaped ASAP
             iren.ExitCallback()
             return
-            
+
         elif key == "F1":
             vedo.printc('\nExecution aborted. Exiting python kernel now.', c='r')
             #settings.plotter_instance.close()
@@ -3001,9 +3001,13 @@ def _keypress(self, iren, event):
                 acts = self.getMeshes()
             for ia in acts:
                 if ia.GetPickable() and isinstance(ia, vedo.Mesh):
-                    ia.computeNormals()
-                    intrp = (ia.GetProperty().GetInterpolation()+1)%3
-                    ia.GetProperty().SetInterpolation(intrp)
+                    ia.computeNormals(cells=False)
+                    intrp = ia.GetProperty().GetInterpolation()
+                    # print(intrp, ia.GetProperty().GetInterpolationAsString())
+                    if intrp > 0:
+                        ia.GetProperty().SetInterpolation(0) #flat
+                    else:
+                        ia.GetProperty().SetInterpolation(2) #phong
 
         elif key == "n":  # show normals to an actor
             if self.clickedActor in self.getMeshes():