Toolset Crash on Area Load

I just posted this in the technical support section of Beamdog’s NWN forum.

The toolset in the latest release is now broken for me. I cannot open the starting area in my module, Sanctum of the Archmage: The Sight. I get a repeated popup error saying “sqrt: DOMAIN error.” The error won’t clear and the area cannot be loaded. I can only stop the error by ending the toolset in the task manager. I have edited this area in EE before with no problem.

At first I thought this was a module corruption error from my new editing work. However the same thing happens when I try to load the currently released and working 1.69 Diamond version of my module, which has never even been opened in EE. Whatever is causing this problem is new in one of the more recent builds of the toolset.