Disable Motion Blur and use consecutive keyframes (i.e. camera position 1 is keyframe 1, position 2 is keyframe 2 - never give it intermediate frames to interpolate). If you're using Terragen 3 you can disable Motion Blur easily with a checkbox on the Renderer node for turning off Motion Blur. In Terragen 2 just set the Blur Length to 0 in the Camera node settings.
- Oshyan