In case this helps anyone else. I was beinng kicked due to PnkBstrA not communicating.
Switched off AVG. Switched off Windows Firewall. Still get kicked.
Checked services running, no PnkBstrA service to be seen, but PnkBstrB was there, so I stopped it.
Downloaded pbsvc.exe and now about to try again. If it works, will quit out and switch Firewall back on, as both services allowed through it.
Here goes nothing....