If you customized the Custom Context menu it will now show up by default since the upgrade do not touch user modified files.
And then you need to add new commands to the context menu your self.
or edit the config file called ContextMenu.xml and add
<MenuItem Name="Open folder" Options="4368">
<MenuItem Command="ExplorerPanel.41056" Options="4112"/>
<MenuItem Command="ExplorerPanel.41057" Options="4112"/>
</MenuItem>