The solution can be to open the window where the mouse is located or where the parent application is located.
Although it should be fixed as it was announced in 11.10: http://www.omgubuntu.co.uk/2011/07/modal-dialogs-land-ubuntu-11-10/ -- You received this bug notification because you are a member of compiz packagers, which is subscribed to compiz in Ubuntu. https://bugs.launchpad.net/bugs/954292 Title: "Modal" dialogs do not appear as expected in multiple monitor setup To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/compiz/+bug/954292/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~compiz Post to : [email protected] Unsubscribe : https://launchpad.net/~compiz More help : https://help.launchpad.net/ListHelp

