title: How to edit markdown cell in jupyter-notebook ( Could not edit markdown cell in Jupyter notebook)
body: <p>I got a strange problem with <code>jupyter-notebook</code>.<br />
  I was practicing with <code>notebook</code> which has markdown and code cells.</p>
  <p>When I save and reopen the notebook, I can edit code cells but not the
  markdown cells.</p>
  <p>Attempts:</p>
  <ol>
  <li>reload the page.</li>
  <li>Make the notebook trusted.</li>
  <li>Try to change the cell type from markdown to code or raw but still can not edit.</li>
  </ol>
  <p>NOTE:
  I can delete some letters on markdown but I can not add any letters.
  Also if I hit enter it will create new lines, but I can not write anything there.</p>
  <p><strong>Question</strong>
  How can we edit the markdown cell of a <code>jupyter-notebook</code> ?</p>