I have the same issue as RFCat_vk, I can't see client info, nothing happens when I click the client column. Ahaa, it is my Firefox that is the problem.... I tried another machine and it works there.

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Sophos UTM 9 (9.004-34) (64-bit)
Home Network
Running on an ESXi 5.0 Host
Virtual appliance details:
2 x 2.66GHz Virtual CPU | 3GB RAM | 30GB Disk | 4 x VMXNET3 Virtual Adapters