Hi Antoine,
Your vzf model was lack of at least one more morph targets.
Because it only hold one mouth open morph, you will need to add one more morph like a normal one and rename the mouth open morph to "mouth_open" to get access with it.
The normal one can be named to "morph" as same as the help file noted.
For your reference.
http://docs.worldviz.com/vizard/p_ad...ph_targets.htm
http://docs.worldviz.com/vizard/p_ma...lking_head.htm