I'm getting an error in my PHP/Apache log: (I renamed the domain and removed the key)
[Mon Feb 03 00:41:19 2014] [error] [client 24.123.216.86] PHP Warning: json_encode() [<a href='function.json-encode'>function.json-encode</a>]: Invalid UTF-8 sequence in argument in /nas/wp/www/cluster-1060/site/wp-includes/update.php on line 254, referer: http://blog.site.com/wp-admin/admin.php?page=contextly_options&tab=contextly_options_api&api_key=REMOVED