Just wanted to chime in and say I'm having the same unresponsive taskbar issue at login with a Razer Huntsman Tournament Edition and Intel 9900KF cpu. It doesn't happen every single time, but enough to be an annoyance for sure. Started happening when I upgraded from an Intel 8700 to the 9900KF - all other hardware is exactly the same, and no other instability issues (everything works fine once I get past the hanging explorer.exe issue). Motherboard is an ASUS Z370-A. I reinstalled Windows 10 as a troubleshooting step, and it happened the first or second time booting into the fresh install before I even had drivers installed, but I have since applied all the latest manufacturer drivers and patches as well. I opened a ticket with Razer today and will work with them to see how I can help, but wanted to share my experience here as well.