Hey there.
There is something problematic with gog version of nwn2 and my PC..
Since i reinstalled gog version of game , it is constantly crashing on various things.. and always during battles.

Before this i was using some very old original nwn2 non gog but from cd-s and they worked flawlessly, for years i was playing even online with it..
But then i reinstalled gog version and this happens.. i tried to reinstall twice same thing happens every time i am in battle, game just crashes..

Almost always :mss32.dll crash
once :MSVCR80.dll

Yes i understand that mss is associated to sound. I even found topic on gog saying to replace nwn1 sound files and put in nwn2.. didnt help..
Suffice to say that absolutely nothing helped.. game went on crashing and crashing upon entering battle or during battle..

Luckily ! I found stored on backup hdd rared archive of my original nwn2 non gog version, i unpacked it used gog serials and i finished campaign without a single crash..
So right now game is perfectly stable but without gog version of game..

What is happening with gog version??

Ati 69702gb ddr5
Asus Xonar DG Sound card.
Intel 2500k
8Gb ram

Yes i am using "ClientExtension" to play game.
Windows 7x64

Any ideas?

I can't help you, but I've been playing NWN2 again lately and I've had a few crashes. The odd thing is I played through OC and MOTB already on GoG's version a couple of years ago without any hiccup. My only guess is that there is some driver problem somewhere. Or maybe at some point Gog's NWN2 was patched to some less stable version.

When I played GOG version of NWN 2 last time, it was crash-free and it never had any additional updates. On other side, I could never work with toolkit properly. It kept acting up and crashing, so I gave up on it. Are you sure it isn't the changes with your system which are the reason?

To OP, original cds didn't have all patches on them, and if you ever simply deleted game directory without uninstalling it manually, it could problems for different NWN 2 installation. And did you try how the game runs without "ClientExtension"? Asking this, as according to what people write, Client Extension isn't exactly friendly with WIndows registry and thus with different installations of NWN 2.

NWN2 has always been somewhat to severely buggy, even during its original life span.

What's worse, due to a legal spat involving D&D licencing a few years ago, the developers were forced to rather abruptly pull the support plug, resulting in the 1.24 patch (which was also expected to be the final big kahuna bug fix patch ... *sigh*) getting thrown into limbo and ultimately becoming vapourware. :( The upshot is that the game remained permanently buggy (including, yeah, some howlers - the one I've seen bite me the most is a bug where the Bag of Holding can disappear after certain story events *ouch*) and will likely never be officially fixed.

Want to blame someone, blame Hasbro pretty much; the impression one gets is they were in an awfully big hurry to get the D&D licence delivered to Cryptic for the Neverwinter MMO (although it seems like Hasbro was in a particularly virulent phase of ill-considered changes to gaming at that point in general - this was around the time when they introduced such clunkers like the Speed Die in the physical edition of Monopoly; hopefully they've started to learn their lesson, I'm hearing some good things about D&D 5 so maybe they have? Still, Googling is indicating some pretty nasty things that were going on - e.g., Atari was apparently allowed to start working with Cryptic right away, while Obsidian was forced to put the brakes on, including not putting out 1.24), and the gamers ended up being the ones to suffer. I guess they figured a 4-year-old by then in the bargain bin game was less important than an MMO which promised such lovely features as $150 microtransaction item enchants (I only wish I was kidding).

Yeah, call me bitter if you like ... I was active in Neverwinter-related IRC around the time this all happened, soo ... yeah. Plus the impression I got at the time was a really depressing one that editable RPG engines in general were dying out, which I don't think I really got over until RPG Maker VX Ace got released (thankfully now it seems the trend is starting to reverse full speed, since we got both NWNs and recently even the old Unlimited Adventures here, creativity lives!). At least GoG was able to patch out the disc check DRM (which was going to be removed anyway, but that ... yup, it was scheduled for 1.24 ...) :)

Well.

This explains why I'll randomly crash to the desktop sometimes if I engage in combat with the wrong type of enemy... like the giant beetles you fight in the swamps when you first leave West Harbor in the base game, or the nightwalkers in the Shadow Plane in MotB.