Problem with utf-8 just in 1.7.3

[omidkorat]

I had 1.7.2 with utf-8 and no problem, but when I upgrade to 1.7.3 in header shows, an error (Cannot add header information - headers already sent by…).
I never modify any php files; just overwrite all new files on older files.
I do another test. Install a 1.7.3 on other place for the first time. Everything was good until that I changed language Charest (and its file) to utf-8!
Whenever that I set utf-8 error appear in header, and when I set to every Charest except utf-8, everything goes well.
In addition, login and logout have problem with utf-8.
I download Arabic language and install it and everything was good. Because it was set to UTF8 not utf-8 and its file does not save as utf-8 format. My language (Persian) just works with utf-8.
What should I do?

[V@no]

Make sure when you save edited files you save them without "BOM". Not all text editors support that...

[indgroup]

I am having the same problem with a clean new install of 1.7.3 .... arabic lang pack didnt work
somehow the UFT8 didnt work
my gallery address is: http://www.groupind.net/gallery

i couldnt solve the problem and i also tried editing the header and set the charset to UTF8 manually .. it didnt work
i still cant make it work in arabic.. unless i go to View in IE and Encode then choose Arabic manually

 

[omidkorat]

but my problem fixed with admin suggestion.
use pspad to save utf-8 files: http://www.pspad.com/index_en.html