One note, in the documentation it states that what opening old project, one will be asked if they wish to use VI-PRO? In Pro Tools that isn't the case. One has to reload in the instrument and it's matrix. Not sure if the docs only mean while using VE-PRO and VI-PRO. Please clarify....
Not the case in Cubase either. But I would assume it only works when using VE-Pro, as I don't see how it could be pulled of in a host not created by VSL. Perhaps if they made the VI-instrument scan for the existence of VI-Pro, but I imagine it would still be problematic to convience the host to exchange the reqested VSTi for another one.