Replace InsertTable with table then try again.

 

Keep me posted

 

InsertTable is the old name of this button.

  <item type="table" />
  <!-- item type="image" name="InsertTable" imagename="instable" /-->
  <item type="image" name="InsertRowTop" imagename="insrow_t" />
  <item type="image" name="InsertRowBottom" imagename="insrow_b" />
  <item type="image" name="DeleteRow" imagename="delrow" />
  <item type="image" name="InsertColumnLeft" imagename="inscol_l" />
  <item type="image" name="InsertColumnRight" imagename="inscol_r" />
  <item type="image" name="DeleteColumn" imagename="delcol" />
  <item type="image" name="InsertCell" imagename="inscell" />
  <item type="image" name="DeleteCell" imagename="delcell" />
  <item type="image" name="EditRow" imagename="row" />
  <item type="image" name="EditCell" imagename="cell" />
  <item type="image" name="MergeRight" imagename="mrgcell_r" />
  <item type="image" name="MergeBottom" imagename="mrgcell_b" />
  <item type="image" name="HorSplitCell" imagename="spltcell_r" />
  <item type="image" name="VerSplitCell" imagename="spltcell_b" />