Ok this turns out to be a bug with ACF Pro 5.2.3. See here for details: http://support.advancedcustomfields.com/forums/topic/bug-acf-pro-5-2-3-and-wp-multisite/.
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Ok this turns out to be a bug with ACF Pro 5.2.3. See here for details: http://support.advancedcustomfields.com/forums/topic/bug-acf-pro-5-2-3-and-wp-multisite/.