Need help - Can't get Live preview Mode to work

[csy]

I need some help to troubleshoot/debug live preview mode.

This is what I get:
deinterlace=none no video, no audio
deinterlace=encoder pass through good video, no audio
deinterlace=deinterlace filter no video, no audio

I have tried every combination of playback video and audio decoder and renderer with no success. I have also tried switching between VMR9 and overlay with no success. To be honest I don't know what I'm doing and trying hit'n'miss configurations based on forum threads I've read.

If I disable live preview mode, then I get good video and audio, even using various differnet video/audio decoders.

I would appreciate someone explaining the video and audio signal paths from the tuner to the renderer so that i can understand how to troubleshoot this problem. Especially regarding what function the deinterlace options do. (for instance what does "encoder pass through" do and why?)

My System
AMD 1.3GHz Duron CPU (20-50% load)
512MB RAM
1536MB fixed paging file (300MB PF load)
TUL theater 550 Pro capture card with latest ATI drivers (6.14.10.86)
ASUS 9550TD video card with latest ATI drivers (6.14.10.6553)
Creative Audigy2 ZX sound card
WinXP SP2
Directx 9.0c with quartz.dll from 9.0b

GBPVR
Version: v0.92.11
Video decoders: Intervideo (default), Cyberlink Video/SP, Dscaler Mpeg2
Audio decoders: AC3 (wave / directx), Intervideo, MPEG, Cyberlink, Dscaler
Audio renderer: SB Audigy2 ZX (wave / directx)
VMR9
No post-processing
Live-TV pre-play delay 500mS