Not sure where this one goes.
I was getting a plain white screen with the word DONE in the lower left corner only. Searched all over the net with no positive results so I experimented to try and find cause. I restarted in safe mode (XP SP3 IE7 KASPERSKY) and all worked fine. Restarted and went to failing site and turned off Kaspersky and all worked fine, was failing before turning off). I called Kaspersky and was finally told that their ANTI-BANNER will stop some advertising scripts from executing, even the ones that are ok.
Looks like this may also apply to other AV programs as well or other anti-banner or banner blocking software. May not sure all but better that what I was able to find on the web.