Did you check to see if all of the machines were running service pack 2? paul -----Original Message----- From: wdmaudiodev-bounce@xxxxxxxxxxxxx [mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Stefan Stenzel Sent: Monday, May 02, 2005 9:43 AM To: wdmaudiodev@xxxxxxxxxxxxx Subject: [wdmaudiodev] USB MIDI device port won't show up some computers Hello, I am developing a Class compliant USB MIDI Device so that I can avoid having to write a driver. Everything works fine, device installs properly on all XP equipped machines, but on a few computers, the MIDI Ports do not show up in the applications. Tried to compare driver versions, compared registry entries without success. Any idea how I could debug this? Thanks, Stefan ****************** 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.de/ ****************** 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.de/