When I try to set a frame size of 160 x 35 MM, it keeps changing the 160 to 164.175. If I go back and retype the 160, it changes it to 159.000 x 33.897. If I retype a 160 over the 159.000, it changes it back to 159.000. Is there any way to make Scribus accept the size of the frame that I key in?