Subtitles stopped working on UE55C8000

Hi.
I was able to stream mkv movies correctly o my Sammie TV using serviio with windows8. I've updated to windows 8.1 and installed the last version of serviio 1.3.1 and now I'm unable to see subtitles on the TV. Help?
PS - subtitles are enabled both on TV and in serviio
Thanks!
I was able to stream mkv movies correctly o my Sammie TV using serviio with windows8. I've updated to windows 8.1 and installed the last version of serviio 1.3.1 and now I'm unable to see subtitles on the TV. Help?
PS - subtitles are enabled both on TV and in serviio

Thanks!