I have had the same problem in the past and it was determined that I had a driver conflict.
[:@]
Solution: for your video card, make sure that 3D acceleration is enabled.
CC

As of 07:58 02/08/08 cannot get to site. Someone was talking about withdrawals

[font="arial"]Well it can only get better. But it had to happen at a time that we are Snowed under in Muddy York.
[:(]
[/font]