What operating system are you using? What graphics card are you using?
All indications are that there is a problem between CorelDRAW 9 and your graphic card / driver. Can you try to disable all enhanced features on your video card to see if this helps?
Gérard
CorelDRAW Graphics Suite X4 (Service Pack 1)
Corel DESIGNER Technical Suite X4
OS: Windows Vista Enterprise / CPU: Intel Core2 Duo / Memory: 2 Gb RAM / Graphics card: nVidia Quadro NVS140M