This post is in response to one bug report that might turn into multiples ones. So in the interest of keeping the bug reports manageable, I'm making this post so that you all know a little bit more about what is known about this particular bug before the reports propagate and get too numerous to track effectively.
Currently, it seems loot is not dropping from killed creatures. This may affect creatures that drop CNR as well. This will presently affect all creatures, not just some within a particular area. As such, it is not necessary to post every area or creature where loot is not dropping properly.