Only other thing I can think of off the top of my head is that you may have a rights issue on your side. I have both the program and content setup on a E: drive to prevent issues of permissions. You could try setting Poser into it's own folder on the C: Drive and Content not in the Public folder.

Poser 5, 6, 7, 8, Poser Pro 9 (2012), 10 (2014), 11, 12, 13