Got Black Screen using External Player (MPC-HC & KM) (1 Viewer)

[lambert01]

TV-Server Version:
MediaPortal Version: 1.0.0
MediaPortal Skin: Blue 3 Wide
Windows Version: XP Pro SP3
CPU Type: PHENOM 8650
HDD: WD 320Gx2 Raid
Memory: 4G 800Hz
Motherboard: GIGABYTE MA78GM-US2H
Video Card: Onboard ATI HD3200
Video Card Driver: Catalyst 9.4
Sound Card: Onboard Realtek
Sound Card AC3: Optical out
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: Cyberlink (DXVA)
MPEG2 Audio Codec:
h.264 Video Codec: MPC HomeCinema
Satelite/CableTV Provider:
HTPC Case:
Cooling:
Power Supply:
Remote:
TV:
TV - HTPC Connection:

I been trying to config KMplayer and MPC-HC to play .MKV files with DXVA support and it work perfect outside Media Portal
But when I used Media Portal to play .MKV files by using external player such as MPC-HC & KMPlayer the screen just go black and nothing happen. This black screen occured only when I'm trying to play .MKV files that support DXVA.
But .MKV files that does not support DXVA work perfectly when Media portal use external player.

Anyone know how to solve this issues?

PS.
I'm using PureCodecPack20090126 with MPC and KMPlayer