I've seen something like this when there was a render going with more threads than prossessors, but the holes filled when the render finished. I never saw it with an animation though. Perhaps it might be something to look at.

---

Available on Amazon for the Kindle E-Reader Monster of the North and The Shimmering Mage

Today I break my own personal record for the number of days for being alive.
Check out my store here or my free stuff here
I use Poser 13 and win 10