It was suggested that this might be a conflict with the theme/Wordpress since the update. Is anyone else having this issue? And how can it be addressed?
AFAIK, Graphene doesn’t do anything with the media uploader/editor in WordPress, so it is most likely a WordPress issue. To test this, temporarily switch to the default theme (TwentyFifteen) and try cropping again. If the problem remains, it’s a WordPress issue, and should be reported on the WordPress forums.