Same issue here. CR-1 visa interview was 2 hours ago. Documentation was all accepted, and was told we would normally be approved, if not for some recent change in the treatment of public charge. We were then given a boilerplate letter for denial of our visa. They did keep the passport, though, strangely enough.
My understanding of the reason was that the risk of someone becoming a public charge was managed by the checks done by the NVC / affidavit of support, etc. But the change, which went into effect sometime in the last 48 hours, seems to refuse anyone who could potentially become a public charge, regardless of any evidence one could gather to show they would not. That includes all CR-1 visa applicants.
I looked around for any news articles or government statements related to this change, but was unable to find any.
Cccl got a reaction from roimmi in Administrative processing due to public charge ruling(?)