netmeg - 3:04 pm on Nov 15, 2010 (gmt 0)
For me it's just a display bug. As far as I can tell, it hasn't affected any rankings or traffic. But it's difficult to tell because the main site where I first noticed this is the one I just moved to an entirely new platform (we flipped the switch on Sept 25) and there was an expected drop in G traffic while the new urls were being processed. That seems to have gone well and is mostly finished - except for the home page, which still displays as www. I know it's been crawled, as it is displaying the new title and meta description, and our sitelinks have changed to match our new navigation. Traffic is beginning to climb again, although almost all the rankings are going to the home page (which is www)
The other sites don't seem to have lost anything either.