Thanks for the reply guys! I going to reinstall & see if that helps. Last time I did so, Vue remembered previous stuff, which is handy in some instances but not all. wabe, this starting at frame 99000 only just cropped up this morning. It says out of memory & either crashes or weirdly then starts to render. Should start at frame 1 onto frame 75, where is 99000 coming from? The aspect ratio narrows with standard PC & 16.9 ratio. I also ran a preview in the timeline, it was PC ratio except the bottom half was black. When it finished & played back it displayed a vertical part of the render but only about a fifth of the frame. Hope some of that makes sense!! Got major corruption that just keeps growing AGGHH!