subtitle glitch

[Rikis]

In attacment with .ass subtitle and external subtitles module (option) showing full screen of rubbish, without external subtitle module showing one line, what shouldn't be here.
With .srt all is ok.
mpc+vsfilter shows both subtitles without this glitch (no subtitles in example).

[Rikis]

It's seems only with kmp mkv reader.

[Primary Filtergraph]
0) - KMP MKV Reader
1) - CoreAVC Video Decoder
2) - KMP Audio Codec
3) - KMP Video Transform
4) - KMP Audio Transform(Copy)
5) - Video Mixing Renderer9(Renderless)
6) - Default DirectSound Device

[Video Info]
Decoder - (MPEG2) CoreAVC Video Decoder
Format - Major Type: Video - Sub Type: YV12
VideoInfo2: YV12 1024X768, 12 bits

[Audio Info]
Decoder - (0x674F) KMP Audio Codec(Vorbis in VorbisFormat-OggVorbis.dll)
Format - Major Type: Audio - Sub Type: PCM
WaveFormatEx: ExtPCM(0xFFFE), 48000 Hz, 32 Bits, 2 Ch

[Basic Video DSP]
Internal brightness: 100%

[Advanced Video DSP]
+Video Plugin

[Audio DSP]
+Pre amplification: Main: (100%)
+Audio Plugin

[Subtitle Settings]
+Draw Mode(Selected): VMR
+Draw Mode(In use): VMR(Renderless)
+Text Rendering Method: Rasterizer
+Support HTML Tags(SMI)

[KMPlayer]
+Version: 2.9.3.1213(5.293.568, 2007.01.24 00:56:48)
+libcodec.dll: Exist(3.884.544, 2007.01.23 23:23:08)
+libmplay.dll: Exist(423.424, 2006.12.22 08:41:44)
+PProcDLL.dll: Exist(1.347.584, 2006.12.12 23:17:08)
+LibDTS.dll: Exist(225.280, 2006.04.29 09:54:52)
+liba52.dll: Exist(103.936, 2006.04.08 18:59:36)
+libfaad2.dll: Exist(335.872, 2006.04.08 18:56:22)
+libmad.dll: Exist(86.528, 2005.03.14 22:18:48)
+libmpeg2.dll: Exist(122.880, 2006.09.01 23:21:00)
+theora.dll: Exist(183.808, 2005.08.04 09:55:32)
+OggVorbis.dll: Exist(1.253.376, 2006.10.27 07:51:30)
+xviddll.dll: Exist(593.920, 2006.11.30 22:21:50)
+wmploc.dll: Missed
+wmpui.dll: Missed
+Old_QUARTZ.DLL: Exist(770.048, 1999.05.05 22:22:00)
+AboutDll.dll: Exist(105.472, 2005.10.03 14:12:18)
+DTView.dll: Exist(104.448, 2006.11.20 21:33:20)
+MPlayer.dll: Missed
+ImLoader.dll: Exist(856.064, 2006.01.15 14:21:26)