Jonathan, I had something weird happen. I was generating a 1600x1200 image (Disk video mode, passes=1) in a Windows XP batch file, and doing an automatic save every 10 minutes. After about 40 minutes, I noticed that it did the fourth automatic save after line #1195. A few seconds later, when it finished, the file was completely gone! (I've never seen this happen in DOS.) I suspect it has something to do with the timing and buffering in Windows - the deleting of the old file after line 1195 not being executed by Windows until after the file was saved again at the end of the fractal's generation a few seconds later. But occasionally, when running a batch job, I've noticed that one of the images was missing, and I had to regenerate that image again. This could have resulted from similar behavior when an automatic save was done just before the image would normally complete. Lee