physlock hangs after using xpra

[ornxka]

After I use the xpra program (even after it has exited), physlock hangs on invocation and nothing happens.

I am using physlock 13, from the git revision d4091fe.
On physlock git-20170902, the version that comes with my operating system by default, it says "physlock: Unable to detect user of tty2" and then exits. I am using NixOS version 19.03. This might have something to do with it, but I can't switch framebuffers with ctrl-alt-f<n> after using xpra, either.

This might not actually be a bug in physlock, especially given the inability to switch framebuffers, but I figured this would be a good place to start looking for answers.

[xyb3rt]

Does it work if you run physlock -L before running physlock and after running xpra?