This seems to be a bug: I'm working on a documentary with multiple language transcripts, and whereas most seem to be no problem (German, Turkish, Greek, Polish) when I try to select and mark text as being from Bosnia Hercegovina the programme always crashes.
I'm running NWE 2.1.1 w/ OS 10.3.5
(PS have just posted the file in question to Nisus via Feedback/Report a Bug)