I noticed the same problem with 2 recently installed gateways. One of them is full Ignition running on desktop (i7-10700K, Win 10 Pro, clean, first-time install), the other one is Edge version running on my laptop (i7-7700HQ, Win 10 Home, multiple version were installed before), both running v8.1.15 in Trial Mode. The value of system tag “CPU Usage” is also -1.