MR816csx locked to cubase even when not used ?

Hi,
unfortunately this do’s not work for me. mr editor still reports that the firewire port is still in use by another application. Kinda crazy considering if I do have the mr816csx as the active hardware in cubase i can still play windows stuff through it. I still think that the yamaha firwire drivers are being given exlusivity to cubase at all times when cubase is running. I hope i am wrong and there is another setting somewhere to uncheck.