Hi johnny-o,
I have fixed some the bugs and uploaded a latest version 1.2.1 of the Msocial theme into wp-content/themes/ folder, you can check and replace the parent theme with the Msocial-new.
Then you can disable debug on your hosting and clearcache. I have added the following code to the wp-config.php to turn-off the wordpress debug.
define('WP_DEBUG', false );
Also. you can add the following code to the wp-config.php file.
define( 'WP_DEBUG_LOG', true );
define( 'WP_DEBUG_DISPLAY', false );