plink is not working with svn 1.5.0 under WinXP

when I use plink at cmd window box, that's fine

E:\Fayland>plink -v fayland_at_xxx.yyy.com
Looking up host "xxx.yyy.com"
Connecting to 64.128.191.220 port 22
Server version: SSH-2.0-OpenSSH_4.0
We claim version: SSH-2.0-PuTTY_Release_0.60
Using SSH protocol version 2
Doing Diffie-Hellman group exchange
Doing Diffie-Hellman key exchange with hash SHA-1
Host key fingerprint is:
ssh-rsa 1024 76:e3:44:da:2a:0a:e3:99:21:ef:e2:8e:5a:ce:3a:01
Initialised AES-256 SDCTR client->server encryption
Initialised HMAC-SHA1 client->server MAC algorithm
Initialised AES-256 SDCTR server->client encryption
Initialised HMAC-SHA1 server->client MAC algorithm
Using username "fayland".
fayland_at_xxx.yyy.com's password:
Sent password
Access granted

but if I use it with Subversion 1.5.0, there sucks
E:\Fayland>set SVN_SSH=C:\\PuTTY\\plink.exe -v
E:\Fayland>svn co svn+ssh://fayland@xxx.yyy.com/var/svn/trunk trunk
Looking up host "xxx.yyy.com"
Connecting to 64.128.191.220 port 22
Server version: SSH-2.0-OpenSSH_4.0
We claim version: SSH-2.0-PuTTY_Release_0.60
Using SSH protocol version 2
Doing Diffie-Hellman group exchange
Doing Diffie-Hellman key exchange with hash SHA-1
Host key fingerprint is:
ssh-rsa 1024 76:e3:44:da:2a:0a:e3:99:21:ef:e2:8e:5a:ce:3a:01
Initialised AES-256 SDCTR client->server encryption
Initialised HMAC-SHA1 client->server MAC algorithm
Initialised AES-256 SDCTR server->client encryption
Initialised HMAC-SHA1 server->client MAC algorithm
Using username "fayland".

it stops. no prompt for password. anything wrong?
I'm using svn 1.5.0 and putty 0.60

Thanks for any hint.

-- 
Fayland Lam // http://www.fayland.org/
Foorum based on Catalyst // http://www.foorumbbs.com/
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