More info from my error logs:
[10-May-2005 10:43:30] PHP Warning: fclose(): supplied argument is not a valid stream resource in /****/******/*****/wordpress/xmlrpc.php on line 1189
[10-May-2005 10:43:30] PHP Warning: Cannot modify header information - headers already sent by (output started at /****/******/*****/wordpress/xmlrpc.php:1189) in /****/******/*****/wordpress/wp-includes/class-IXR.php on line 371
[10-May-2005 10:43:30] PHP Warning: Cannot modify header information - headers already sent by (output started at /****/******/*****/wordpress/xmlrpc.php:1189) in /****/******/*****/wordpress/wp-includes/class-IXR.php on line 372
[10-May-2005 10:43:30] PHP Warning: Cannot modify header information - headers already sent by (output started at /****/******/*****/wordpress/xmlrpc.php:1189) in /****/******/*****/wordpress/wp-includes/class-IXR.php on line 373
[10-May-2005 10:43:30] PHP Warning: Cannot modify header information - headers already sent by (output started at /****/******/*****/wordpress/xmlrpc.php:1189) in /****/******/*****/wordpress/wp-includes/class-IXR.php on line 374
The “headers already sent” errors appear to be caused by the “supplied argument is not a valid stream resource” error.