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Does anybody know what could be going on and, more importantly, whether I can stop it?
I started noticing this on a couple of sites after the October update. I saw it today on another. Just the home page disapears, but the interior pages still get their PageRank (presumably via the home page). I can't explain it.
My current speculation is that it may be linked to another thing I've noticed. I set up my homepage as myname.com. But my highest-ranking inbound link is to www.myname.com. Google sporadically lists the www version, while AltaVista now list them both.
I'm wondering if Google's freshened index (with the date) looks at myname.com, finds it to be missing that powerful inbound and selects other pages on my site.
Why the problem should resolve when I hit on the index a second time, I'm not sure.