There were error(s) loading the rules (pfctl: DIOCADDADDR: Device busy): pfctl: DIOCADDADDR: Device busy - The line in question reads [0]:

[Bob.Dig]

While changing a firewall rule in Nexus I got this:

11:55:46 PF was wedged/busy and has been reset.
11:55:46 There were error(s) loading the rules (pfctl: DIOCADDADDR: Device busy): pfctl: DIOCADDADDR: Device busy - The line in question reads [0]:

Can't say that something isn't working but never got this Error with the old UI.

[Bob.Dig]

Probably unrelated but Nexus is reporting 81% Memory usage while pfSense oldUI is stating 43%. Might be only a visual thing because of being a VM?

[marcosm]

That can happen in either GUI - particularly when there are lots of reload requests or when reloads are already happening. It's not necessarily an issue if subsequent filter reloads succeed. Was ThreatGate ZTE in use? It may be that it was in the middle of something at that moment. We're improving the resource usage in the next release but I can provide an early Nexus build if you'd like to test.

[Bob.Dig]

@marcosm ThreatGate isn't in use yet.

Memory Usage: It is constantly showing this for me. System Information Widget is showing the same, much lower, value in both UIs.