I have a 765T and I have this same problem, Jill speaks the directions just fine, but is completely silent in the language guide. I only have the Spanish tts voices installed for the guide but they don't work either. The dictionaries work just fine though.
I am not sure if this is a fix or not but using this tool [Only registered and activated users can see links. ] I got the voices in the dictionary to work. HOWEVER, I had to flash my device with hybrid singapore firmware, so that may not be for everyone. I didn't figure this out, Neil did.
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