I have the same problem here.
I have WDTV Live and it has automaticaly downloaded the newest firmware itself.
So, how can I load external subtitle if a MKV file already has muxed/built in subtitles.
I have tryed with the same name SRT:
Example:
Underworld.Rise.Of.The.Lycans.2008.BluRay.1080p.DTS.x264.dxva-EuReKA.mkv
Underworld.Rise.Of.The.Lycans.2008.BluRay.1080p.DTS.x264.dxva-EuReKA.srt
It does not work. How so?