Hi, I have started to get this problem with the latest release of tg2. It's ok until I open a node window as a separate window and then maximise the 3d window in the main terragen app then I start to get this problem. Not straight away but after messing around with the nodes for a well. I know when it starts to happen because the heighfield lines and the camera lines become thicker than they normally are.
I have a nvidia 8800 gfx card with newish drivers and like I said it only happens to me when I open a separate node network window and maximise the main 3d window. I used to do this with previous version and didn't get this problem.