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passwordless ssh root logins stopped working after testing dist-upgrade

I dist-upgraded yesterday and ssh root logins started requiring a
password.  I also tweaked some other stuff and installed calibre
and miro to check them out and they came with a boatload of
dependencies so maybe there's something lurking there.

Regular user ssh logins work just fine.  I decided that it would be a
good time to update my keys and redid everything very carefully from
scratch.  VERY CAREFULLY checked .ssh and authorized_keys permissions,
etc.  No change.  This affects both user->root@localhost ssh logins
and to remote hosts.  It smells like an ssh-agent problem, but then
why would regular user ssh logins continue to work?

Tia for any clues.  I won't be surprised if I did something dumb...

I've got a stock /etc/ssh/sshd_config and very long time
modified ssh_config:

root@feyerabend> diff -u ssh_config ssh_config.dpkg-dist
--- ssh_config  2010-04-05 21:14:26.172871668 -0700
+++ ssh_config.dpkg-dist        2010-01-04 09:05:12.000000000 -0700
@@ -17,8 +17,8 @@
 # ssh_config(5) man page.

 Host *
-ForwardAgent yes
-ForwardX11 yes
+#   ForwardAgent no
+#   ForwardX11 no
 #   ForwardX11Trusted yes
 #   RhostsRSAAuthentication no
 #   RSAAuthentication yes

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