I'm having the same issue. On the VNC version (:7802) no buckets are shown, on the webversion I just get an error without result returned when trying to show buckets.
The logs basically gives success on the certificate check for BackBlaze and then throws the following error message.
2018-10-22 10:48:58,763207 [WARN ]: [ CBC ] [ 4 ] Cloud operation error (InvalidAutorizationAccount):
2018-10-22 10:49:41,947630 [WARN ]: [ CBB ] [ 14 ] Operation return error: err(9):