I have spent quite much time on fixing the encoding of Russian text encoding on my WordPress blog. It worked just fine everywhere, but in the admin interface there were some problems with the most popular tags. It has wrong encoding, although it was alright on the main page.
The solution was simple. We could add the following line:
AddDefaultCharset utf-8
to the .htaccess file in the root dir. There should be no lines starting with AddDeaultCharset.
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