I've just tried the GOG version of NWN with 9.1 and after a quick test run it appears to be working with no major issues. The only issue, in fact, is that the movies don't seem to display. When I start a campaign, I can hear the audio for the cutscene, but all I see is the loading screen at 100%. If I click or press escape to skip, it jumps straight into the game running normally, no visible glitches, sound is normal as far as I can tell.
I should also note that I'm running in a virtual desktop window. I generally prefer it anyway, but it does seem to improve compatibility with many games.