Based on Krakatoa 1.6.1.44019 (available from http://www.thinkboxsoftware.com/krakatoa-downloads/beta-builds/) I didn’t have any trouble with a very simple scene.
skew_test.max (196 KB)
I suggest you try the version I linked to. If you are still having render artifacts, please prepare a max scene that will allow me to reproduce the problem. Thanks!