Found a bug with MR 30.7 using MR 33 APs.
After upgrade clients fail to connect to an Open with RADIUS SSID. Clients are setup to use MAC-based authentication to a cloud RADIUS service. Clients are unable to connect to the SSID.
Workaround is to disable Client Load Balancing in the Network Template in Wireless > Radio Settings > Basic Indoor Profile > Edit.
Clients instantly connected to the SSID with the issue as soon as I turned off Client Load Balancing in the network template.