ssh -Y stopped working after reboot

[Moriah]

I have a dual NIC machine I use as an internal firewall. It doesn't get rebooted often, but the other day a power failure alerted me to the fact that the last time I worked on its hardware, I plugged it into a non-battery backed up outlet (my dumb mistake), so the power failure rebooted it. After that, I can no longer forward DISPLAY with ssh -Y root@machine when I log into that machine from another machine. It worked up till the reboot.

I assume that somewhere between that reboot and the previous one (months ago) a routine update clobbered something and caused this annoyance. I checked the /etc/ssh/ files to make sure X11 forwarding was enabled. Since I do log in as root (there are no other usernames on that machine), I suspect something changed to make logging in as root an issue.

Any ideas on what it might be and how to fix this?
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[dmpogo]

[pjp]

What about when you use -v, does it produce anything notable? You can try an additional 2 v's (-vv and -vvv), but the output can sometimes be excessive if fewer v's work.
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