Do you mean you get the shrugging man as when the thumbnail is missing, or do you mean the thumbnail pic doesn't appear?

If the latter, this is caused by having more than a certain number of items in that library folder. There is an easy fix.

Look in your Poser 5 folder for a file:
Runtime>Prefs>libraryprefs.xml
Open this file with notepad or wordpad.

Find this line:
LibraryPreferences curFolder="0" previewNum="100" 
(It will have brackets around it but I can't seem to show these in the forum, sorry)
Change the "previewNum" value from 100 to a higher value.
Save the file and exit.
Restart Poser.

Hope that works :-)

---

"you are terrifying
and strange and beautiful
something not everyone knows how to love." - Warsan Shire