Cyrillic suddenly turning into question marks

I've made an application which shows cyrillic text, but all of a sudden all the cyrillic turned into question mark signs inside a squared box. This has nothing to do with my script, as I开发者_如何转开发 checked my backup which is working and it was just the same there. Can it be something with my browser? I've tried to restart it. I'm using Chrome.

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Are you using a meta tag that sets a charset?

It looks as if the Cyrillic alphabet uses utf-8.

http://webdesign.about.com/od/localization/l/blhtmlcodes-ru.htm