TabletPC pen advances slides in Powerpoint 2007

Writing on slides in PPT 2007, which is enhanced from PPT 2003 as one now can write on the presenter view window, requires that "advance slide" using mouse click is set to off. It seem to be ON by default, which means that slides advance when you try to write. Unselecting the box takes care of this, but I have not found a default setting to "off".