Anyone got any idea why I'm getting this all of a suden on some props within Poser6?

I've done 3 virus scans that have found nothing, I've deleted and redone my preferences, PMD's are off and I've done a complete uninstall and reinstall and I still get this message on some props that did work fine before.

Injustice will be avenged.
Cofiwch Dryweryn.