Odd as it seems, and stranger yet, it only happened to one of our sites, after upgrading to WP3.4, the title of one of our sites changed from "sitename" to "sitename 12345".
I discovered it in the 'view-source page' using Chrome 19.0.1084.56 m, and it appears in the site tab in that browser. When I open the WP dashboard and go to Settings/General/Site Name it shows correctly (without the added spaces and the '12345'.
Obviously, I need to find out where this change came from, why it is there, how it is affecting my search engine rankings and a host of other issues.
Also, I am under the impression that the php call: ?php wp_title(''), pulls its info from the Settings page. Am I incorrect on this? Remember those setting look fine but the title in the page source is different.
Could really use some help on this.