The BUILD function may be the critical part here. You must BUILD and SAVE a module to see changes in many cases.
Well, you need to save it. During development, Build is unnecessary unless you've changed an included script, in which case Build offers a convenient method of recompiling all scripts. Prior to release, the other Build functions such as missing resources are worth running for good order.
Turning to the OP, are the changes there in the toolset when you re-open the module? My first guess is that you might have two copies of the module, one in the program file, the other in the c drive root. You could be changing one then running the other. If that's the problem, I'd back up all the files you've made, uninstall nwn and remove any residual files, then reinstall in the c drive root where it's supposed to be (afaik).
Less drastically, there may be a way of changing paths somewhere so that only one version is used, but I don't have detail on that.