No mention of any problem when I Google this
Site:
So many posters are reporting the identical problem starting on the same day that you think there'd be some mention of it on Google or Google news, but it's as if there's no problem at all. Is this some kind of limited thing? Some malware that those of us who have the problem have been infected with?
Whatever it is, it would definitely be nice (and professional) for Pinterest to publish some sort of comment on it, so that at least we know what we're dealing with.