Here's an extract from e-on support knowledge base, statement from e-on team on January this year, regarding V6I (but probably applicable to other V6 because they all probably use the same SDK):
http://www.e-onsoftware.com/support/ShowMessage.php?id=1169748339&stage=-1&chooseCategoryPage=&categoryName=&category=&subCategory=&superCategory=
"It may be that the current Poser SDK we use is not compatible with multiple Poser 7 runtimes. This is mainly because the SDK is basically designed for Poser 6, so there are still problems with Poser 7. We are still working on this along with e-frontier to improve the compatibility with Poser 7."