Problem displaying subtitles in MKV files on Sony BDPS370

I have followed the steps in the post by Patters http://forum.serviio.org/viewtopic.php?f=11&t=2004 to try and get subtitles to work when using MKV files but whenever I try to play an mkv file I keep getting the message "The file is corrupt or unsupported". The Sony BDPS370 is displaying the files as DIVX with an asterisk against the title.
I have looked at the post regarding compression in mkv files and mediainfo mentions nothing about compression.
I'm now stuck so any advice would be greatly appreciated.
I have looked at the post regarding compression in mkv files and mediainfo mentions nothing about compression.
I'm now stuck so any advice would be greatly appreciated.