There is a weird Google bug with the cache feature. It seems to only impact home pages. For example, a search for this site in Google returns a Google search result of the home page (we aren't penalized yet):
But when you click on the cache link, it takes you to a dead page:
This does not appear to impact inside pages, but rather only the root page (aka home page). Why?
I have been receiving emails reporting this, as well as spotted several threads in the forums about this. Threads come from Google Webmaster Help and WebmasterWorld.
I should note that this isn't uncommon and I wouldn't worry about this impacting your Google rankings.
Forum discussion at Google Webmaster Help and WebmasterWorld& HighRanking Forums.



Comments:
Jez
09/01/2010 12:30 pm
It is affecting some inside pages: http://webcache.googleusercontent.com/search?q=cache:VtpC-r2B2PIJ:kotaku.com/5609770/rumor-borderlands-studio-reviving-duke-nukem-forever+kotaku&cd=2&hl=en&ct=clnk&gl=uk&client=firefox-a http://webcache.googleusercontent.com/search?q=cache:uXE7Mtx2EvcJ:www.rockpapershotgun.com/2010/08/25/a-blood-red-state-dead-state-revealed/+rock+paper+shotgun&cd=2&hl=en&ct=clnk&gl=uk&client=firefox-a
Carl Hendy
09/01/2010 06:09 pm
It seems John M is already on the case! http://twitter.com/JohnMu/statuses/22719992759
John Muelelr
09/01/2010 07:10 pm
This should be fixed now :-). Thanks for your patience!