TV breakup in TV Guide (1 Viewer)

[doveman]

With a few TV channels (E4+1, Sky Three, Dave), they work fine in full screen but breakup badly in the small window in TV Guide. I checked in TV Server config, and these 3 channels do all have slightly lower signal level than the other working channels, but I still don't understand why they would only breakup in TV Guide.

TV-Server Version: v1.0.2
MediaPortal Version: v1.0.2
MediaPortal Skin: Blue3Wide
Windows Version: XP Pro SP3
CPU Type: Intel P4 2.8Ghz Northwood (non-HT)
HDD: 500GB Western Digital SATA
Memory: 1.5GB DDR
Motherboard: Gigabyte 8i848-PM
Video Card: Leadtek FX5600 256MB VIVO
Video Card Driver: 175.19
Sound Card: onboard Realtek AC97 (ALC655)
Sound Card AC3: no AC3
Sound Card Driver: 5.10.0.6300
1. TV Card: Hauppauge Nova-T 500
1. TV Card Type: DVB-T
1. TV Card Driver: 4.3.26168.0
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 Video/SP Decoder (PDVD7)
MPEG2 Audio Codec: MPC - MPA Decoder Filter
h.264 Video Codec: MPC - Video Decoder
Satelite/CableTV Provider:
HTPC Case: Custom
Cooling: Nexus 120mm Intake Fan, Accelero S2, Mini Ninja
Power Supply: DELL DA-2 AC->12v DC, mCubed EF28 DC-DC board
Remote: Nova-T 500
TV: Sony XBR800 36"
TV - HTPC Connection: DVI