Sorry to bring up this somewhat old post ....
To check if my gfx card causes severe flickering, I've opened the above capx file and experienced that same as I see on my system.
So now it looks as if my gfx card driver (which is hard to update because I bought a cheap ACER computer to just compile W8 apps) prevents me from working.
If someone can confirm this, I'd be grateful.
Here is what happens when I load the above pathfinder.capx
It loads fine in C2 but as soon as I test the app (preview) the flickering begins.
I am sure it is my system