If this doesn't work, try this alternative.   JAFrEx To start JAFrEx, press the Play button (triangle) in the bottom left corner. When it has finished, you can click on the display to choose a zoom area. Click again to choose another area if the first is unsatisfactory. Pressing Play will generate a new fractal of the selected area. At any point during fractal generation you can stop it by pressing the Stop button (square). During generation, the Play button can be used as a Pause/Continue button. It will change appearance to reflect its operation. Pressing Stop while stopped will reset JAFrex. Click here for a fullscreen version. In fullscreen mode, the keys 'Alt-F4' can be used to exit.