Msg#: 4525994 posted 4:00 am on Dec 8, 2012 (gmt 0)
I just had that happen. http://www.example.com was fine http://example.com turned unverified There is a redirect in place to go to www so no quick way to place the verification file. A day or so later, it fixed itself.
Msg#: 4525994 posted 8:37 pm on Dec 8, 2012 (gmt 0)
Personally I hate that Google allows GoDaddy and various hosting companies to verify themselves as Webmasters for ALL of the sites they host through their API. Everytime I see that a new user has been verified for my site, it freaks me out. I go look and it's GoDaddy or whomever. So I revoke their user, delete their verification HTML file from all of my domains... and wait to get freaked out a few months later when they rerun their scripts.
Msg#: 4525994 posted 11:15 am on Dec 9, 2012 (gmt 0)
There have been several issues with GWT recently involving verification. A glitch temporarily gave domain access back to accounts that shouldn't have had it and the fix resulted in the sites remaining in GWT accounts but appearing as not verified. I think they are being extra cautious right now, it's better that you re-verify than to find out someone else is peeking.