Your document window is 781x1069? What size screen do you have? When you import the picture, you say you get the message "the background width/height ratio is different than the current window" and you press Yes to change the picture. If your document window is the same shape, then this shouldn't happen. Go to Window>Document Window Size to check the current size. (My screen is set at 1280x1024 - Poser won't let me enter your screen size as my document window. I'm wondering if you have a high screen res, if the bottom of the document window is off your screen?)

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"you are terrifying
and strange and beautiful
something not everyone knows how to love." - Warsan Shire