May 14, 2011, 03:48:59 pm
I had the same issue when I first installed Lumion on my new machine. Updating my Nvidia drivers and DX-9 fixed it. On my older slower machine, I'd get it occasionally too and I'm positive it was a memory issue in that case. Try restarting the computer and not opening any other programs besides Lumion. Also I've noticed that if there are going to be issues in the animation, they also tend to show up in a still render. You may want to test a photo render to see if it is clean before committing the time to process the full animation.