Ssh non-functional after Leopard update

Hi everyone
I upgraded to Leopard three days ago, and I am still trying to solve problems it appears to have created.
One of these problems is that ssh doesn't work.
Pearl:~ clytie$ ssh 10.1.1.1
percent_expand: NULL replacement
Pearl:~ clytie$ ssh -v
OpenSSH_4.6p1, OpenSSL 0.9.8e 23 Feb 2007
usage: ssh [-1246AaCfgkMNnqsTtVvXxY] [-b bind_address] [-c cipher_spec]
[-D [bind_address:]port] [-e escape_char] [-F configfile]
[-i identity_file] [-L [bind_address:]port:host:hostport]
[-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p port]
[-R [bind_address:]port:host:hostport] [-S ctl_path]
[-w localtun[:remotetun]] [user@]hostname [command]
Pearl:~ clytie$
"ssh ADDRESS" or "ssh HOSTNAME" simply gives the "percent_expand: NULL replacement" response, which I don't understand.
(Luckily, we also have a Mac Mini on our home net, which I haven't upgraded to Leopard yet, so I was able to ssh from that machine.)
I am really disappointed that so many things appear to have been broken by the Leopard upgrade. Repairing permissions, restarting and installing new versions fixed some of the problems, but I still can't receive email (separate thread), and I shudder to think what else is broken that I just haven't tried yet.
Thankyou for any help you can offer with this.

Google finds this fix:
http://www.nabble.com/ssh:-percent_expand:-NULL-replacement-t4701144.html
which works for me.
Be careful when copying the config data: trailing spaces cause config errors.

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