Ahhh, I see the problem. It lies in the HOSTS file on my machine
C:\WINDOWS\system32\drivers\etc\hosts

It's a relatively new machine, and I haven't tinkered with my HOSTS file. I'm wondering if it came this way, or if AdBlock in FireFox made the changes. Either way, I can't see the ads. Perhaps that's why Dave Barnes is also seeing the grey box.

127.0.0.1 pagead.googlesyndication.com
127.0.0.1 pagead2.googlesyndication.com #[Google AdWords]
127.0.0.1 adservices.google.com
127.0.0.1 ssl.google-analytics.com #[urchinTracker]
127.0.0.1 www . google-analytics . com #[Google Analytics]
127.0.0.1 imageads.googleadservices.com #[Ewido.TrackingCookie.Googleadservices]
127.0.0.1 partner.googleadservices.com
127.0.0.1 www . googleadservices . com

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Luke Spence | C. Carey Cloud | CJCA - Cracker Jack Collectors Association