MKV standards just got an update it seems, I've been using mkvmerge to merge movies with icelandic subtitles and after mkvtoolnix 5.9.0 VLC and this blu-ray player have trouble seeking in the file. It's the same problem VLC is having. Something about elements or something. Could you please update this, since my player tends to freeze while playing...well whatever, it would be very lame to have to begin at the beginning of a movie after freezing.