MP RC2: Need help setting up HVR1600 to play nicely

[dreamwalker]

TV-Server Version: 1.0 RC2
MediaPortal Version: 1.0 RC2
MediaPortal Skin: Default
Windows Version: XP SP 3 with all windows update as of 8/19/08
CPU Type: P4
HDD: 240 GB SATA RAID 0
Memory: 1GB
Motherboard: ASUS P4PE
Video Card: ATI HD 2600
Video Card Driver: 8.3n
Sound Card: CompUsa generic
Sound Card AC3:
Sound Card Driver:
1. TV Card: TwinHan 1020A
1. TV Card Type: DVBS
1. TV Card Driver: 2.3.8 BDA WHQL
2. TV Card: Hauppauge HVR 1600
2. TV Card Type: DVBT
2. TV Card Driver: 3.4D1
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: nVidia PureVideo 1.02.233
MPEG2 Audio Codec: nVidia PureVideo 1.02.233
h.264 Video Codec: ATI h.264
Satelite/CableTV Provider: DishNetwork / OTA
HTPC Case: Generic
Cooling: None
Power Supply: Generic 400 PSU
Remote: MCE, Gyration
TV: Samsung 52"
TV - HTPC Connection:

Hi everyone, I'm trying to see how I can get my HVR1600 to play nicely here for digital ATSC tv. The card scans and picks up a slew of local channels OK. However, the previews don't work anymore (it did work at some point back). I know there's a 80 something post thread on just getting the HVR 1600 detected and scanning, but I think my problem seems different. I just can't get it to preview correctly at all anymore Log files attached if anyone can help!! The card works fine with recording and everything using MCE so I know its not hardware issue.

Also, does anyone else have a problem with the GUI being slow when there's tv (from my twinhan) being played back? My CPU is around only ~50%. I'm thinking there's a bottleneck between the client and the tvserver? Any tips on troubleshooting this?