MP hangs with anamorph HDTV + CoreAVC + VMR9 excl

[fanformusik]

TV-Server Version: 1.0RC1
MediaPortal Version: 1.0RC1
MediaPortal Skin: Monochrome 1.7
Windows Version: Windows XP SP3
CPU Type: AMD64 X2 BE2400
HDD: 250GB Samsung
Memory: 2GB
Motherboard: MSI K9AGM2-FIH
Video Card: AMD X1250 (AMD690G)
Video Card Driver: ATI Catalyst 8.5
Sound Card:
Sound Card AC3:
Sound Card Driver:
1. TV Card: Floppy DTV
1. TV Card Type: DVB-C
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: PDVD7
MPEG2 Audio Codec: PDVD7
h.264 Video Codec: CoreAVC 1.7
Satelite/CableTV Provider: KabelBW
HTPC Case: HIPER
Cooling:
Power Supply:
Remote:
TV: Viewsonic VX2835wm
TV - HTPC Connection: Sub-D

Luxe TV HD broadcasts in anamorph HDTV format. CoreAVC obviously (still) has problems restoring the proper aspect ratio and displays the picture in wrong (native) format. So the AR has to be set to 16:9 manually, which I do by right clicking into the full picture area, then selecting change aspect ratio from the menu box, and so on...

Now If VMR exclusive mode is used, MP's GUI hangs right from the moment the menu box comes up (live TV still continues)
If VMR exclusive is NOT used, MP works fine and I can do what I want.

There is no problem if Cyberlinks H.264 decoder is used (but this loads my CPU to 100% and the picture stutters)

I have to use VMR exclusive to avoid tearing, so unchecking this mode is not a good solution for me.

Any ideas?

P.S.: YES, I know I have to attach error logs, but I cannot create them. Once MP hangs it is still in the VMR exclusive mode and there is no way to change over to the Windows desktop. The only way is to turn the computer off. If someone tells me how, I will create and supply the logs.