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The following has resolved this issue when encountered with over 90% of those reporting the issue.

In that folder is LSMGUI.html and LSMGUI.swf, the two pieces that make up the Library GUI. Launch Poser and double click the LSMGUI.html file and launch it in your browser. LSMGUI.html will display the Library as a standalone (but Poser must be running). Viewing this in your Browser may reveal the problem. If you also have Firefox, try using that to check the File when Poser is running.

Hi I seem to be having the same problem. I have followed the instructions multiple times, and I am still having the problem in Poser 8 and in IE. when I load the file LSMGUI.html in firefox (with poser running) it shows the library in the firefox window. however the item is still the blank screen in poser 8 and IE. This makes me think that the problem is with a setting for IE. Now I went over a large number of them but I am unable to figure out what to change. Anyone else have some ideas?