First which Primo you are using?
Have you seen if you have vautov dll?
Delete folder loq or nuance_v5 you have and copy once again....
Do you have seperate dll files and voice file(I mean do you have voice file in sd card and tts_engine in internal memory card)?
do you have this entry in sys.txt:
If you still have problem post to upload igo_version and tts!