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