Screen anomaly when using pencil tool (AICS5)

Question

I've discussed this before, without resolution. Since upgrading to a new iMac, I see a flickering square at the cursor, when editing a path using pencil tool and Wacom tablet. Specifically, it appears when holding "Cmd" and selecting a path or "Option" dragging along a path to simplify the path. I captured a screen video and to my surprise, the square did not appear. In it's place is either a red or black circle. I am guessing these circles are part of the AI interface that I do not see on screen. I have not found any preference or documentation about them. If interested, please review this video. You'll see the circle, but not the flickering square I see on my screen. I'd appreciate help solving this mystery.
http://youtu.be/NXuRqkHgVF8
AICS 5 (15.0.2)
Mac OS X 10.7.5
Wacom Intuos 5
Thanks,
Ray

Answer 1

Thanks, Wade.
This is a brand new computer. Card is working well in every other aspect.
I am up-to-date with all Apple and Wacom driver updates.
Question: Am I supposed to be seeing the red and black circles that appear in the video? I have NEVER seen these, in my 25 years of working with Illustrator.