IMac screen sharing broken again?

There was an iMac firmware upgrade today. Now screen sharing isn't working (again). Is anyone else having this problem?

I'm having this problem now, with one machine in my house; none of the above solutions work.
(I've seen the NetAuthAgent hang on the client before, where it's listed as "not responding" and killing it allows the client to connect. That's not happening this time.)
The symptom I see is that if I try to connect to my headless G4 Mac Mini, using any method I know about (clicking "share screen" in the Finder, using Finder's Go command and using "vnc://machinename", or using "open vnc://machinename" in Terminal, or launching the Screen Sharing app myself and using File->New and entering the machine name): the first time, nothing happens. If I then try again, I get the small black window. I can ssh into the mini and see the ARD and VNC processes running; if I use the ARD kickstart utility to restart the VNC server, it disconnects the client. But the client never connects far enough to show me the remote screen.

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