Been posting them for months without a problem, is this a new restriction????
No, it's a pretty old one. Back to 2004 at least. Updated FR Excerpt and Link Only or Deny Posting List due to Copyright Complaints
Caption George H.W. Bush (Everyone, please don't post Getty images) - 05/14/2004
Post Hurricane Katrina IMAGES Here (But please, no Getty images) - 08/29/2005
I'll just add that I don't see myself as some sort of "copyright police," and that my "uh oh" is triggered only when I see a watermark or similar - in that image, the watermark was fairly prominent.