Just updated to ACF 3.1.8, and get_fields( 'options' ) no longer works (for the options page add-on. Looking at api.php, it seems that the options page was forgotten when the options were moved from wp_postmeta to wp_options in the db. The function just returns false if you pass it 'options' as the argument.
This has pretty much broken the site I am working on, as we are using the options page add-on extensively. Elliot's website is down too, so I can't even contact him for support.
Anyone know of a workaround?