I had a similar problem when I got my new computer and shifitng to only running on a single core fixed it for me but I did not do it the way you did.

I solved the problem by editing the nwnplayer.ini file.
Now, I'm not sure which number was the original one but I editet where it says "Client CPU Affinity" and switched the number from whetever it was to -2 (( Client CPU Affinity=-2) running on a pentium i5 processor).
Perhaps it might be of some help but please just remember to back-up the file before editing in it =) and if not, I'm sadly out of ideas =(

-Render

Will not be home until sunday evening but please take a few screenies if possible.

wont be home this weekend except for perhaps sunday night if that aint too late

Wednesday is perfect for me

some time next week (monday-thursday 10pm GMT+1) would be the best but I understand that it might be a bit late

Waylon Renders walks up to the librarian and gently taps him on his shoulder Excuse me sir and please don't be alarmed due to the state of my arm. In fact that is why I am here.
A few days ago a novice of the mage guild came here looking for a book on how to possibly mend this shows the librarian his arm but I have not heard from him since.
I now come here to ask you if you happen to have any books or information on how to mend a damage like this or if its even possible to restore the lost muscles and flesh? As there is nothing more than my bones left on what used to be my left arm, I greatly appreciate any information I can get.

Waylon enters the library and starts to rummage through the books. He quickly notices a book called "On the Ever-Changing Chaos of Limbo". After about an hour looking through it he approaches the librarian

Excuse me sir. I am looking for information regarding something called chaos mist….I did find this book regarding the outer plane of Limbo holds out the book to show him but do you have anything else that might be more specific on just chaos mist?

* Waylon walks into the library and starts to search for any information regarding the Ecclesians*