[tuxen]

@popcornmix: Above shown behavior in external srt subtitle while reproducing 3D SBS mkv file, still not fixed. Any ideas?

Can you upload the srt file and I'll see if I can reproduce it.

Of course, here it is.

Works fine here on beta 5
On previous builds I had to manually set the movie to side by side in system->system->video output, if I chose same as movie (autodetect) the GUI and .srt sub would not split.

Try this:
Go to system->system->video output
Set -preferred mode (right under stereoscopic mode) to side by side.
Go to system->videos->playback
Set playback of stereoscopic videos to: use preferred mode.
Alternatively set it to ask me, if you choose this approach then choose side by side and not same as video, autodetect (even though it says side by side) in the question box that pops up when the movie begins.

All my 3D movies .srt and GUI works fine now though.

Official beta5