Ribbon vertical separator in group is no longer displayed in Office 2016 (Word, Visio, ...)

Create a custom XML Ribbon using Custom UI Editor or Addin Customized XML with a separator.

It is never displayed.

Any Clue ?

Sample XML Ribbon :

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<customUI xmlns="http://schemas.microsoft.com/office/2009/07/customui">
  <ribbon>
    <tabs>
      <tab idMso="TabHome">
        <group idMso="GroupEditing" visible="false" />
        <group idMso="GroupClipboard" visible="false" />
        <group id="CustomGroup" label="Editing and Clipboard" insertBeforeMso="GroupFont">
          <splitButton idMso="PasteMenu" size="large" />
          <button idMso="Cut" />
          <button idMso="Copy" />
          <control idMso="FormatPainter" />
          <separator id="Sep1" />
          <button idMso="FindDialog" />
          <button idMso="ReplaceDialog" />
          <menu idMso="SelectMenu" />
          <dialogBoxLauncher >
            <button idMso="ShowClipboard" />
          </dialogBoxLauncher>
        </group>
      </tab>
    </tabs>
  </ribbon>
</customUI>

Michel LAPLANE (MVP Visio)