Thank you, Matt...I am running Windows 10 and BIAB 2018. I DO have multiple monitors, but none are extremely high resolution (1920x1080). However, I do think you might be on to something. After more experimentation, I am finding that just right-clicking on the note is not enough...the mouse pointer has to be centered PRECISELY in the center of the note to get the context menu. The mouse seems to work normally with other programs.