WordPress MU

hello
i have a problem with my wordpress Mu.
the site was working well. but after the server administrator hase upgread Apache and PHP Version, my wordpress dose't work good.
the main problem that the arabic language file does't work now.
what i have to do?

Please take a second and review the readme file that came with your install. A link is in there to a debugging script which makes suggestions on what you need to do. (ie Check your error logs, give specifics when you post here, etc.)

the problem may be caused by 64 bit systems, see this post:
http://wordpress.org/support/topic/146921?replies=5#post-660333

thanl you Radja
the problems hase been solved