There's a wiki about that mod and possible issues here: https://nwn.wiki/display/NWN1/Beamdog+HD+Pack . I'm guessing you tried reinstalling?
The mod is intended for the EE version only... I'm assuming you are aware of that. Some players are running the Diamond version for example.
The version you're using is a Beamdog one with community fixes... you could try the official Beamdog release here: https://files.beamdog.com
Judging by the comments on Steam, the HD pack has a few issues which Beamdog are aware of...
@showler is right though - you'll be lucky to get any help posting in the Vortex thread... I came here because I saw Neverwinter Nights in the title and wondered who on earth (other than me) could be still playing that game.
I hope it resolves and someone else is more help. NWN is an amazing game. Still. 😉
