Sorry to be a pest. I am testing the plugin for use primarily with PDFs. I have a test page at: http://modedion.cairohouse.net/pdf-demo/
(see option 3)
It works more otr less fine on 3 of my PCs (Win7 64bit, Win7 32 bit, and XP SP3) using a variety of browsers. But on the 4th PC, XP SP3 and IE8, the popup works fine first time around. But after clsoing it, re-opening it causes the window's border and b'ground to be painted but no content appears. Refreshing etc has no effect. One has to close that page altogether and open again in new tab.
I appreciate that It's probably impossible to pin down, but any help appreciated.