So what I worked out that intermittent dropouts would happen or sometimes the computers wouldn't detect at all if I didn't add the machines by IP instead of name via the network scan. This didn't fix my OP issue though, as it still won't display the actual screens and hasn't done so correctly via the KMS screen since 4. beta. From memory someone had said it was working, but I couldn't replicate this across 4 computers, all running Win 11 24h2. The KVM sidebar displays all monitors fine but in order to any computer to appear on the KVM full screen i have to uncheck "only show computers that are powered on.