Since I upgraded to the Sighthound 6 beta, there hasn't been a single new entry to "People", "Vehicles", or "Animals". It marks moving objects just fine, but it puts everything under "Unknown objects". I tried using higher resolution camera streams, but that made no difference. I also completely uninstalled and re-installed Sighthound (including clearing out the Sighthound folder under %LocalAppData%), but that made no difference either. One thing I noticed is that the Sighthound camera logs keep showing errors like the one below around the times that motion occurs:
error: [Errno 10061] No connection could be made because the target machine actively refused it
Is it running some local server where it connects to itself to identify objects? The Windows firewall is disabled, and I'm not running any other security software besides Windows 10's built-in antivirus.