Call svn executable from php on windows hangs forever

Hi everybody.
I don't know if this is the right ML to write to, tell me if you think
I should ask somewhere else please.

I'm trying to call the svn.exe executable from a php script (I know
there is php_svn and other ways but now I need to test this).
For example a simple

<?php
chdir('c:\\local_working_copy');
$output = shell_exec('svn help');
?>

works as expected printing the help message. If execute "svn ls"
instead of "svn help" it just waits forever until I kill the process
manually.
Obviously the same command from the command line works as expected, I
use svn+ssh and have configured the SVN_SSH env var with password too
(just to be sure it's not an authentication problem).
My svn client is 1.3.2 (I installed the last one I think), ssh client
is plink.exe 0.58, OS is windows 2k pro sp4 patched and webserver
Apache/2.2.2 + PHP/5.1.4 (xampp 1.5.3a).

My sensation is that if called from command line it's not interactive,
if called from webserver it expects something else forever...

If someone can help me in any way I appreciate it very much, thank you.

-- 
Kamal
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