I have a similar problem.  Some additions to the libraries from within Poser 7 show up as they should and work fine.  But if I look for the corresponding files within Runtime they are not there.  I have found that the program puts the files in a folder called AppData which is normally hidden.  AppData can be accessed (after making hiddden files visible) by following Computer/Local Disk (C:) / Users/your user name/AppData/Local/VirtualStore/Program Files/efrontier/Poser7.  You can manually move the files into the appropriate library files within your Runtimes.  I don't know why this happens or how to prevent it.