tedster - 3:24 am on Dec 8, 2012 (gmt 0) [edited by: tedster at 4:57 am (utc) on Dec 8, 2012]
Periodically Google does say a site is not verified, even though it used to be verified. All you need to do is repeat the verification and all is well in Webmaster Tools.
Ranking has nothing to do with whether a site is verified in Webmaster Tools. The only thing that is affected is your ability to access the information that WMT offers about the site.
[edited by: tedster at 4:57 am (utc) on Dec 8, 2012]