Change subtitle in a .srt? (1 Viewer)

[soder]

I've finaly mananged to get my .mkv with multipe subtitles to change with command ACTION_NEXT_SUBTITLE. I use vsfilter.2.37_nt and ffdshow ffdshow-rev1405_20070804 and the newst matroska.

BUT in my .srt with multiple subtitles I cant change lang. with ACTION_NEXT_SUBTITLE.
Why? Different commands for those two subtitle files?

/Söder

TV-Server Version:
MediaPortal Version: 0.2.3
MediaPortal Skin: wide
Windows Version: XP MEdia Center
CPU Type: AMD
HDD:
Memory:
Motherboard:
Motherboard Chipset:
Motherboard Bios:
Video Card: NVIDIA
Video Card Driver:
Sound Card:
Sound Card AC3:
Sound Card Driver:
1. TV Card:
1. TV Card Type:
1. TV Card Driver:
2. TV Card:
2. TV Card Type:
2. TV Card Driver:
3. TV Card:
3. TV Card Type:
3. TV Card Driver:
4. TV Card:
4. TV Card Type:
4. TV Card Driver:
MPEG2 Video Codec:
MPEG2 Audio Codec:
Satelite/CableTV Provider:
HTPC Case:
Cooling:
Power Supply:
Remote:
TV:
TV - HTPC Connection:

 

[soder]

Anyone having the same problem?