Hi, I have similar problem. I have read that it could be caused by having added this website as malware website (or as cracked) on Wordfence servers.
I hope Wordfence specialist would answer for this issue.
Kind Regards,
Bartosz
Thank you for your advices! I have downgraded the plugin from v3.15.0 to v3.14.10, and it is working again. I am looking forward to publicizing official version of 3.15.1