Parham Now it could be, that "alt+control+m" is assigned as shortcut to a start menu item. If so, you must disable it. Or perhaps it is assigned to a setting of your graphic card. Such shortcuts should be disabled. Another thing: Make sure, that ins Sibelius preferences (I think, display settings) transluceant windows) is unchecked. Regards Claudio > -----Original Message----- > From: sib-access-bounce@xxxxxxxxxxxxx > [mailto:sib-access-bounce@xxxxxxxxxxxxx] On Behalf Of Parham Doustdar > Sent: Tuesday, May 18, 2010 3:08 PM > To: sib-access@xxxxxxxxxxxxx > Subject: [sib-access] Re: Something I forgot on the mixer problem > > Claudio, > > Yes. Ctrl+alt+M (the hotkey used for opening/closing the > mixer) says the below text: > > The Mixer window could not be opened. If you wish to unsubscribe, send a blank message with the single word, unsubscribe - in the Subject line to: sib-access-request@xxxxxxxxxxxxx