If you browse with your editing program and look in your nwn root directory it should show all the screenshot files. Windoze doesn't always show them, and as you said, the clipboard only holds one. All I can think of for not getting the page to display is perhaps you need to clear some cookies?... dunno. my wife is the webpage guru, I just play games...
Hope that helps, and hope someone else can answer the other part. Have fun!
Vyris