Sorry you were having problems with the hub 3 interface. I have just tried it on our test one with safari and it seems to be working, it was the same firmware level as yours by the way. If it is still happening it may be worth trying a factory reset of the hub Resetting your Virgin Media router
I'm having the same issue with the latest firmware version as of 28/07/2017 (9.1.116V).
I do not want to reset the whole modem to defaults as I've invested a considerable amount of time into configuring a while bunch of devices in DHCP, filters, etc. I'd like to see the software do what it is supposed to do.
This isn't the only feature broken on this page. The radio buttons for the currently registered list are supposed to put the correct details into the Add reserved section. Yet for most of them they put in the wrong MAC address (from one of the other entries) in.
I have the same problem. Also mac filtering for time period doesn't work. Hub 3.0v software is rubbish, only fix seems to be to buy own router but why should I for features I've been using for years on other modems/routers. We pay enough for virgin services !!!!!