The District House in Greyport is one of only a few areas that retextures the 'Fort' Interior Tileset with UD (Dark) textures (the Hub is another such area).
For a long time these retexture scripts were unused in the UD, due to their causing crashes in certain players. We tested this in the Greyport District House and found that crashes were near 100% when transitioning from one retextured area, into other.
It was only eventually sent live when we thought the issue fixed on the NwN end, and I'm now concerned that the problem may have reappeared following recent updates.
Can I ask - did you transition from one area of the District House to another when this crash began?
Have you tried disabling NwN graphic options (such as toon) before attempting to load in?
If I decide this is a retexturing issue I can disable it in that area, but this would revert it to the old brown/yellow colour. Furthermore, we would likely then also need to revert the hub.