[Fractint] Rotating the Zoombox Problem

I used to rotate the zoombox using the ctr-pos1 or ctr end keys but that doesn´t work anymore probably as I have a 16/9 screen. Found out that it´s still possible with a trackball or mouse using the right button and straight left or right movement but that´s not reliable as all other zoombox functions are supplied and you might loose the image. Question: which keys can do the job?? Grateful for any help Albrecht