So the crash appears to be video card related. I suggest you ensure your drivers are up to date from your video card vendor.
Keith,
Upgrading video card drivers fixed the crashes.
Now, another problem cropped up. As you can see in the attached pics, when I divide the matrix into left and right and put a different color "on" effect on each side, it works as expected.
However, if I use the "marquee" effect on each side, I have missing pixels. Even as I increase the "thickness" of the effect from 1-4 pixels wide, the weirdness follows the extra outlines.
Charles