It probably is not the interpreter version, but I can't say that for certain. If you're using the interpreter packaged with the template game that comes with the latest versions of AGI Studio, I'd recommend at least trying a different interpreter if not using another one all the time (as far as I can tell, sound doesn't work in the interpreter packaged with the template game...it's a hacked version 2.936 interpreter...an unhacked 2.936 interpreter is available at agidev.com).
The only other thing I can think to do is as was previously suggested. Post the words.tok file or send it to someone to look at it.