Update 9th June 12:45 BST: This problem has been fixed as part of today's release. All meta data and verification codes should now be present.
There is currently a problem with the way meta data is being presented to search engine crawlers. As a result, it is not currently possible to verify sites with Google Webmaster Tools, AdSense, or Analytics, and some users may find that Google has been unable to crawl their site.
Our Development team have identified a fix for the problem, and it will be released with the next update to the software, which should occur within the next 24-36 hours. Please accept our apologies for the inconvenience.