The save button for the Wireless options (SSID/WPA2 edits) continued to work, so it wasn't every save button across the system. It was only an issue for me on the device editing pages. As I said, doing a factory reset fixed the issue, so my best guess was corruption during a recent firmware update.
I'm afraid this is all the info I can provide, but hope it helps.
Cameras are the same type exactly, but the issue is the same for other networked devices such as range extender
I'm not sure a screenshot would help, you can change say the wireless key in the box, but when you try and save it simply does not.
Neither do you get the warning box that alerts you that devices may loose connection etc.
As ZooBurner says, I can't see the point of screenshots, but I attach three in sequence - original settings, changed settings and result after saving - no change. Oddly enough I did successfuly change another device name and icon when I was doing the screenshots and this was one that would not save previously
I'm experiencing this 'inability to save changes problem' as well (not for the first time: https://community.bt.com/t5/BT-Devices/Cannot-save-changes-in-Hub-Manager-SmartHub-2/m-p/1962485 ) and I'm now on the latest version of the the firmware ( v0.15.00.06145-BT, updated 28 Sept).
When I had the problem previously (running earlier firmware) a factory reset resolved the issue, but the problem has returned these last few days.
A partial workaround is that the MyBT App allows me to change the name of devices, but it doesn't offer the ability to change the icons associated with the devices.
I suspect another factory reset will once again fix the issue, but it looks to me that there is an underlying issue that is causing the problem.
For the time-being I'll resist the factory reset as it is only a minor problem. Everything else on my network works a charm.
Perhaps one of the mods with an eye on this thread can pass this on with all the other comments.