Chris, I've upgraded to v4.20.21 on a separate laptop and studio launches normally. On the computer I'm having issues with, I've uninstalled and deleted studio.xxx and tried to run as admin but still get the same results...it locks up on load. I shut down all of my firewall and and antivirus, including windows firewall. Same result. Obviously, it is an issue with my computer but I have no idea what to try next. Suggestions? I'm going to try a system restore next.