The reason I ask is that there was a crash bug in an older version of the chat plugin SIMTools uses that would crash if SIMTools' logging was enabled and not otherwise. DId you have logging enabled only on one of the two modules? Other than that, there was also a crash bug caused by typing certain characters, but that is also long since resolved.
Not sure about the logging business. Its the default setting for both modules, the SIMTools_Test mod is the one supplied and I didn't change anything. You mean fky_chat_config something? or NWNX.ini properties?
Given all that you've said, the problem has to be in the plugin, not the scriptset. You should head over to the NWNX boards and ask virusman to look into it (he and dumbo are the ones who wrote the lin and win versions, but dumbo isn't around any more, as far as I know).