It would seem that Obsidian has run into an issue with patch 1.13 where there is an issue with haks loading and unloading from memory.
Rob McGinnis Obsidian Community Coordinator had this to say about it over at the official NWN2 forums.
"Well, we have run into an issue with this latest patch. There is currently a problem that has cropped up regarding haks loading and unloading from memory. We are running through a ton of tests right now to see how big the issue is. If the issue is limited in scope, we will be locking the patch down within a day or two. If the issue is not limited, then we will not lock the patch down until that issue is fixed. Watch here for more news."
You can find the forum thread here at the NWN2 forums.
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