lucy24 - 8:20 pm on Sep 13, 2012 (gmt 0)
sometimes you'll see that when you don't have the proper character set installed on your computer.
If your computer doesn't have a single font with Cyrillic characters [alanwood.net], you need a new computer ;) The problem is far more likely to be an elderly browser that doesn't do Font Substitution so you have to change fonts manually. If it's a very old browser, it can't even read the <charset> declaration. But that's oooold. (Like, say, MSIE5, my Gold Standard for elderly browsers.)