Yesterday a strange bug appeared in Chrome: In a small web app we have some umlaut characters like äöü. Strangely said characters were displayed as cyrillic, but only on my pc... On every other device it worked. I spent about 5 hours of checking encodings (everything was in UTF-8), reading posts in the almighty stackoverflow.
Finally i figured out, the font was broken. After reinstalling it, everything was peaceful again in my head.