Plugin does not work properly in a table

Solution #1:
You should set “table-layout: fixed;” for your tables
Go to edit your theme style.css and add this rule:
table { table-layout: fixed; }
or add css rule inline:

<table style="table-layout: fixed;">
  <tr>
    <td>
      [gmedia id=4]
    </td>
  </tr>
</table>

Solution #2: (not responsive)
Wrap shortcode with DIV element which have width in px (percent doesn’t work in tables)

<table>
  <tr>
    <td>
      <div style="width:500px;">[gmedia id=4]</div>
    </td>
  </tr>
</table>

set width to fit your layout.