Unfortunately that does not seem to be working. Stop vApp does stop all of the *visible* VMs (all Windows Server 2008 R2) but I'm then presented with an error message which reads "Cannot stop"...when I click for further details I see "Unable to stop network Training Network XXXXXXXX". I take is this is the "service machine"...the little virtual router that connects the Training Network to the Org VDC Network.
Any other ideas? I'm really stumped here.