There is now a stickied thread over at Guru3d.com about RT and 2142. I can confirm that if you have monitoring enabled using Riva Tuner, it's most likey the cause of your lock-ups/freezes. If you're just using it to overclock, you won't have a problem. If you using it for automatic fan control or monitoring (temps, FPS, whatever), you will get lock-ups. I am able to manually set my fan speed with Riva Tuner and then exit the application and the play 2142 fine, but if the logging server is running in the back ground, it will cause problems.