pop up window (1 Viewer)

[picorama]

TV-Server Version:
MediaPortal Version: 1.00.
MediaPortal Skin: blue wide 3
Windows Version: vista sp 1
CPU Type: core 2 duo
HDD:
Memory:
Motherboard:
Video Card: asus 8800gt
Video Card Driver:
Sound Card: hda dts
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: mpc
MPEG2 Audio Codec: mpa
h.264 Video Codec: mpc or coreavc
Satelite/CableTV Provider:
HTPC Case:
Cooling:
Power Supply:
Remote:
TV:
TV - HTPC Connection: sony 40"

I´m having trouble with 2 of my latest mkv. files.
A pop up window shows every time i try to play these 2 files.
Everything else works fine.



dosnt matter if i use mpc latest , or coreavc.
i have even subtitels disabled.
If i click away the pop up, the movie starts just fine.

martin