Unable to view settings dialog in DO 9

I recently installed DO 9 on my laptop and am experiencing the following problem. When I invoke "Settings, Preferences" the resultant dialog window does not display. The "Preferences" entry in the task bar appears, but the corresponding window is not in view. It's like it is being displayed on an area of the display that is not visible. Please advise as to how I can change this behavior or tell DO where to display this dialog.

See here: [Opus 9 in vista dont open the settings window)