I've got this error too:  In fact I came to post about it.
PHP Notice: Array to string conversion in /home/foouser/foosite/public/inc/classes/BxDolTemplate.php on line 2361
PHP Notice: Array to string conversion in /home/foouser/foosite/public/inc/classes/BxDolTemplate.php on line 2361
but I am not running nginx, this error occurs on Apache as well.