Not sure since when it started happening, but I can't load the stats. It just displays the loading icon until it times out and gives me the following error:
User Agent: "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/20100101 Firefox/17.0"
Page URL: "[WP install]/wp-admin/admin.php?page=stats&noheader"
API URL: "http://dashboard.wordpress.com/wp-admin/index.php?noheader=true&proxy&page=stats&blog=7335568&charset=UTF-8&color=classic&j=1:2.1.1"
http_request_failed: "Operation timed out after 90000 milliseconds with 0 bytes received"