Vytautas , Have you tried restarting your machine since this new behaviour began? The only other time I know of this happening was when the user didn't have enough memory to meet Sibelius' requirements. How much RAM do you have? Dan Rugman visit the new on-line resource for visually impaired musicians and home of Sibelius Access. www.musicaccess.co.uk -----Original Message----- From: sib-access-bounce@xxxxxxxxxxxxx [mailto:sib-access-bounce@xxxxxxxxxxxxx] On Behalf Of Vytautas Jr Sent: 12 August 2009 05:30 To: sib-access@xxxxxxxxxxxxx Subject: [sib-access] "the mixer window could not be found. This is a serious problen..." Hi All, It has recently occurred that I get this message that I've written as the subject line everytime I touch my keyboard in a Sibelius score. I tried opening and closing the mixer window, and it says it can't be opened. What else can I do? Thank you. Cheers Vytautas If you wish to unsubscribe, send a blank message with the single word, unsubscribe - in the Subject line to: sib-access-request@xxxxxxxxxxxxx If you wish to unsubscribe, send a blank message with the single word, unsubscribe - in the Subject line to: sib-access-request@xxxxxxxxxxxxx