I to had this issue.

It has to Window's Internet Explorer 11.  When you update to this version for some reason it disables the Poser Library window.  I went in to my Windows auto updates and uninstalled that updated (Internet Explorer version 11)  rebooted and that fixed the problem.  Poser 9 or higher will not work with IE-11 for some reason. 

This helped me and might help you

Good luck.....

Regards,

Thaarhac.

PS - If you've already fixed the problem.....Er, never mind.....LOL