[badbob001]

I installed a new instance of EMM and tested copying my settings files from my original instance until it has the same problem. Turn out it's this entry in AdvancedSettings.xml:

  <ComplexSettings>
    <Table Section="*EmberAPP" Name="CustomTabs">
      <Item Name="*Extras" />
    </Table>
  </ComplexSettings>

So I'm ok now and will probably not mess with the same settings until I do more research into it.