So, I figured I'd give this new Death Knight class a try now that I'm back on my computer for a little, when I noticed something odd happen with this class. Particularly, the Aura of Poison passive. If I have it active and put another point into it, or remove one granted there are still 1 or more points in it after, its starts up an endless chain of the buff overlaying on top of itself. It continues to do this until horribly lagging and making your character look like he's going nuclear. This doesn't seem to effect enemies, they still only get hit by the poison once rather than stacked.
Edit - Here's a picture of what happens