When I get the ? in my library, I usually just give Poser some time to find it.  I didn't have the issue until I started loading tons of content into Poser 8.  I just assume that Poser 8 was taking it's time to read stuff since after about a minute all of them had number in them.  This is a process that I can actually see happen.

Is this a bug? or Poser just reading?

Frederick
Poser By Design