Thank you for all of your suggestions today, raven.

As it happens, I do already have the camera pointed to the figure's head - I found it helpful while positioning the camera to have it always pointed at her head. I just confirmed that it is still set up that way, and it is, and I am still getting her rendered off to the right of the screen (despite the fact that she appears in the centre of the Preview screen.

Are there any other possible fixes? Am I the only one that Poser has ever picked on in this way?