Hi,all, I have built the sample src/audio/sysfx APO in the WDK and installed it for the HD Audio device. But when i enabled the APO by unchecking "Disable System Effects" in the audio property page, Windows popuped a dialog box and give the error "Windows Audio Device Graph Isolation has stopped working". The HD Audio Device cannot work unless restarting the system. So anyone can help me about the problem? Thank you! Best Regards, ------------------ Jun Xue 2007-08-17 ****************** 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/