diff --git a/Slides/cell_manager.py b/Slides/cell_manager.py
index f8bbf37..18664b0 100644
--- a/Slides/cell_manager.py
+++ b/Slides/cell_manager.py
@@ -1,133 +1,133 @@
 #!/bin/env python3
 
 import os
 import subprocess
 import shutil
 import nbformat
 ################################################################
 
 
 class NotFoundNotebooks(Exception):
     "Could not find the notebooks to treat"
 
 ################################################################
 
 
 def mergeNotebooks(notebook_files, add_cell_number=False,
                    select_functor=None, modify_functor=None,
                    out_filename='talk'):
     "Merges several notebooks in a single one"
 
     def _select_functor(_i, _cell):
         return True
 
     if select_functor is None:
         select_functor = _select_functor
 
     def _modify_functor(_i, _cell):
         return _cell
 
     if modify_functor is None:
         modify_functor = _modify_functor
 
     print("Merging notebooks {0}".format(notebook_files))
     notebooks = [nbformat.read(f, as_version=4) for f in notebook_files]
 
     if len(notebooks) == 0:
         raise NotFoundNotebooks
 
     cells = notebooks[0]['cells']
     for n in notebooks[1:]:
         cells += n['cells']
 
     new_cells = []
     for cell_number, c in enumerate(cells):
         if not select_functor(cell_number, c):
             continue
         # print(c)
         new_cells.append(modify_functor(cell_number, c))
         if add_cell_number:
             new_cell = nbformat.notebooknode.NotebookNode()
             new_cell['cell_type'] = 'markdown'
             new_cell['source'] = 'Cell number {0}'.format(cell_number)
             new_cell['metadata'] = {}
             new_cells.append(new_cell)
         # print(new_cells)
     notebooks[0]['cells'] = new_cells
 
     nbformat.write(notebooks[0], out_filename)
 
 ################################################################
 
 
 def launchSlideServer(filename, options="", font_size="25px"):
     " Launch the HTTP server for reveal slides "
     dir_name = os.path.dirname(__file__)
     slides_config_file = os.path.join(dir_name, 'slides_config.py')
     # reveal_path = os.path.join(dir_name, '..', 'js', 'reveal.js')
     # cmd = ('jupyter nbconvert --to=Slides.myslides.SlidesExporter
     #         --config {1} --post serve '
     #        '--ServePostProcessor.open_in_browser=False'
     #        ' --reveal-prefix={0} {2} talk.ipynb').format(
     #                    reveal_path, slides_config_file, options)
     cmd = ('jupyter nbconvert --to=Slides.myslides.SlidesExporter '
            f'--config {slides_config_file} '
            f'--post serve --SlidesExporter.font_size={font_size} '
            f'--ServePostProcessor.open_in_browser=False {filename}')
     print(cmd)
     subprocess.call(cmd, shell=True)
 
 ################################################################
 
 
 def generateHTML(filename, options="", font_size="25px"):
     " Launch the HTTP server for reveal slides "
     dir_name = os.path.dirname(__file__)
     slides_config_file = os.path.join(dir_name, 'slides_config.py')
     # reveal_path = os.path.join(dir_name, 'js', './reveal.js')
     # cmd = ('jupyter nbconvert --to=Slides.myslides.SlidesExporter
     #          --config {1}'
     #        ' --reveal-prefix={0} {2} talk.ipynb').format(
     #                    reveal_path, slides_config_file, options)
 
     cmd = ('jupyter nbconvert --to=Slides.myslides.SlidesExporter '
            f'--config {slides_config_file} --SlidesExporter.pdf_format="true" '
            f'--SlidesExporter.font_size={font_size}'
            f' {options} {filename}')
 
     print(cmd)
     subprocess.call(cmd, shell=True)
 
 
 ################################################################
 
 
 def generateBeamer(filename, options="", font_size="25px"):
     " Launch the HTTP server for reveal slides "
     dir_name = os.path.dirname(__file__)
     slides_config_file = os.path.join(dir_name, 'beamer_config.py')
     # reveal_path = os.path.join(dir_name, 'js', './reveal.js')
     cmd = (f'jupyter nbconvert --to=Slides.beamer.BeamerExporter '
            f'--config {slides_config_file} '
            f'--BeamerExporter.font_size={font_size}'
            f' {options} {filename}')
 
     print(cmd)
     subprocess.call(cmd, shell=True)
 
 
 ################################################################
 
 
 def executeNotebook(filename):
     " Request the execution of all cells "
     print('execute notebook: ', filename)
     dir_name = os.path.dirname(__file__)
     slides_config_file = os.path.join(dir_name, 'slides_execute_config.py')
-    subprocess.call('jupyter nbconvert --to=notebook --output tmp.ipynb'
+    subprocess.call('jupyter nbconvert --NotebookClient.timeout=-1 --ExecutePreprocessor.timeout=-1 --to=notebook --output tmp.ipynb'
                     ' --config {0} {1}'.format(
                         slides_config_file, filename), shell=True)
     shutil.move('tmp.ipynb', filename)
     subprocess.call('jupyter trust {0}'.format(filename), shell=True)
 
 ################################################################