Although its too late now, you can add the following to the SpectroSERVER $SPECROOT/SS/.vnmrc file
bypass_corba_shutdown=true
The next time the SS is started and stopped, it will not request from the CORBA clients to shutdown and will shutdown by bypassing the CORBA requests. We have found that sometimes the CORBA requests are not responded to and this can cause the SS to hang at shutdown. There is no harmful or negative effects in adding this bypass_corba_shutdown=true to the .vnmrc file.
Best regards,
Glenn