Just noticed this in my servers error log
2014/06/17 15:58:28 [error] 28712#0: *13662 FastCGI sent in stderr: "PHP message: PHP Fatal error: Uncaught exception 'Guzzle\Http\Exception\ClientErrorResponseException' with message 'Client error response
[status code] 401
[reason phrase] Unauthorized
[url] https://identity.api.rackspacecloud.com/v2.0/tokens' in /var/www/example.com/htdocs/wp-content/plugins/rackspace-cloud-files-cdn/lib/php-opencloud-1.9.2/vendor/guzzle/guzzle/src/Guzzle/Http/Exception/BadResponseException.php:43
Stack trace:
#0 /var/www/example.com/htdocs/wp-content/plugins/rackspace-cloud-files-cdn/lib/php-opencloud-1.9.2/vendor/guzzle/guzzle/src/Guzzle/Http/Message/Request.php(145): Guzzle\Http\Exception\BadResponseException::factory(Object(Guzzle\Http\Message\EntityEnclosingRequest), Object(Guzzle\Http\Message\Response))
#1 [internal function]: Guzzle\Http\Message\Request::onRequestError(Object(Guzzle\Common\Event), 'request.error', Object(Symfony\Component\EventDispatcher\EventDispatcher))
#2 /var/www/example.com/htdocs/wp-content/plugins/rackspace-cloud-files-cdn/lib/php-opencloud-1.9.2/ven", client: 54.81.171.167, server: tapebrain.com, request: "GET /lists/classic-movies-weekly-1/ HTTP/1.1", host: "tapebrain.com"
2014/06/17 16:01:24 [error] 28712#0: *13676 FastCGI sent in stderr: "PHP message: PHP Warning: Creating default object from empty value in /var/www/example.com/htdocs/wp-content/plugins/rackspace-cloud-files-cdn/admin/functions.php on line 39" while reading upstream, client: 94.253.180.169, server: tapebrain.com, request: "POST /wp-admin/admin.php?page=rs-cdn-manage HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "tapebrain.com", referrer: "https://tapebrain.com/wp-admin/admin.php?page=rs-cdn-manage"