No video on mkv files when on English speech

I just downgraded firmware to 0.01.1 from 0.01.11 because I got speech lag on mkv files. Now when I change the speech from Russian to English I lose the video.  Is there any firmware that works o/k?

Is the 1.01.12 worth trying?  I don’t stream from the Internet.

I have found it works if the sound is put through the television in stereo instead of digital through my home theater.