Facebook seems to have recently changed it to where that box is unchecked by default. A week ago, it was the opposite. Not sure if this is something they've done on a site-by-site basis (based on their checks for spam, removed posts, etc) or across all sites. Either way, unfortunately, there's no way for us to check this box automatically though.
We'll look into it some more.. hopefully, it's just a bug on their end that will be fixed.
Alex
autocheck post_to_profile checkbox
