There was a now closed discussion from February 2024 with this same description. This morning, I started Quicken on Proton VPN and it worked OK. A little while later, Quicken was not responding to mouse or keyboard. When I shut down the VPN, Quicken worked again. I'm sure that it was VPN related because it wanted me to sign on to Quicken with my user ID and password, an indicator from my past experience that Quicken is not seeing the internet connection. But I wasn't able to log on until I closed the VPN.