Question: Big Sur and smart cards
I have been using a YubiKey nano 5 for smart card login to MacOS Catalina for several months. I upgraded to Big Sur yesterday and since then, I've been having intermittent problems.
When I take an action in the GUI that requires root privileges, I get the normal prompt "XXX wants to make changes. Enter your PIN to allow this." However, this dialog gets stuck and the action never completes. After I enter my PIN, the dialog hangs with the buttons and PIN field disabled. If I remove the smart card, the dialog becomes active again and switches to asking for password. If I enter my password, the dialog hangs again. If I insert my YubiKey again, the dialog becomes active and asks for my PIN, but after I provide my PIN, the dialog hangs.
Smart Card login to Mac OS works fine. I have not touched the smart card configuration at all. Smart card PIN at terminal prompts for root privilege seems to work fine. Re-launching Finder does not solve the problem. Rebooting solves the problem for a short time, then it returns.
I'd appreciate any help.
macOS Big Sur
Mac Pro (Late 2013)