I've been having the same issue since end of last year and I thought that it was my computer. I was a little amused at the beginning waiting for it to resolve itself.
The issue appears on and off, but it's becoming really annoying. I tried to open Bing maps and everything was in Thai. I don't have the least idea of Thai and I'm located far away from Asia. All the settings are right on my computer both region and languages.
So, why am I getting content in Thai?