WordPress MU

Hello,
I have installed Wordpress Mu on a PHP5 web host. I've installed it with the Hebrew language file.
I tried to change the language in various locations, but all in vain.
I assume this is a problem on the web server, some unknown setting. Because the same installation worked on another server.

Any ideas what might this hidden setting be and how do I fix it?

Thanks by advance.

I tried to change the language in various locations

Some specifics as to what you've done would be helpful. You may also want to check the webserver's error logs to see if something is being reported as an error on this install. (Please note that both of those are suggested debugging items in the readme file included with your download)

Here's a link to the codex on how to install a new language within wordpress. The same instructions apply. Does what you;ve done compare to this?

Link

Just in case, your language files should be within wp-includes/languages

Yeah. Sorry.
I've tried to change the language from:
wp-config.php
Site Admin --> Options -> Default Lanuage
Options --> Blog Language

The language files are in the correct location.
I did not find any error logs related to this problem.

same thing is happening to me. did you find a way to fix it?