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Your problem is indeed the loss of the Ubiquiti switches. They have their own internal web server which serves an overview of what is connected to what, effectively their routing tables... it's this which the Cloud Key (or whatever) is using to draw the topology.
The missing part of the picture is because the data is missing.
Frustratingly, whatever switch you have does know this stuff... it's just not exposed to connected devices via any API, it's just internal knowledge, hence it cannot be seen or factored into a topology graph.
Your choice is: 1) Live with it, or 2) Replace switches with Ubiquiti switches.
Velocio-
Cheers. I thought that may be the case but couldn't really remember whether the timeline worked out and I thought it being a tough switch rather than a Unifi one counted against that idea.
I do need to replace the switch, I'm currently using a couple of PoE injectors and a spare switch, but all the unifi stuff being out of stock and costing twice as much as the alternatives probably means I'll live with it.
aggi
They are assigned via DHCP (I looked at fixed IP but it's one of those areas where googling the settings only gets you solutions to far more complicated problems).
The APs work fine, are still adopted and I can see everything that is connected to them in the client devices. It's just that the topology screen no longer shows a nice map with the APs and what is connected to each.