Mahattan WP8060 Tablet - Mouse works, pen doesnt move cursor

I’ve got a Manhattan WP8060 tablet and it works fine on Windows after installing the drivers. On Linux it shows a very weird problem though.

The mouse provided works fine on the tablet, but the pen does not. The pen doesn’t move the mouse cursor, and doesn’t cause mouse clicks on buttons. However, it does cause mouse clicks for window focusing and item selection (in a listbox). There’s no tablet enabled under SaX2, so does anyone know why this is happening and how I can get the pen to work?