Hello Philip, > FWIW, I don't get this on two devices here, but then I am using > wavecyclic miniport for both of cases. I removed _PROPOSEDATAFORMAT handler and nothing changes. An attempt to destroy a stream is made only when "Test" button clicked. Other audio applications don't cause such problem. So I'm forced to add SetState calls to my WavePciStream class destructor to make a workaround. Regards, Eugene ****************** WDMAUDIODEV addresses: Post message: mailto:wdmaudiodev@xxxxxxxxxxxxx Subscribe: mailto:wdmaudiodev-request@xxxxxxxxxxxxx?subject=subscribe Unsubscribe: mailto:wdmaudiodev-request@xxxxxxxxxxxxx?subject=unsubscribe Moderator: mailto:wdmaudiodev-moderators@xxxxxxxxxxxxx URL to WDMAUDIODEV page: http://www.wdmaudiodev.com/