MediaPortal crashes when tuning to weak ATSC channel (1 Viewer)

[tranp]

TV-Server Version:
MediaPortal Version: 1.0.0.0
MediaPortal Skin:
Windows Version: Windows XP SP3
CPU Type: Core2 Duo 2.66 GHz
HDD: Samsung 1 TB
Memory: 4 GB DDR2 6400
Motherboard: Asus P5Q-EM
Video Card: integrated IGD
Video Card Driver:
Sound Card: integrated Realtek
Sound Card AC3:
Sound Card Driver:
1. TV Card: Pinnacle 800i
1. TV Card Type: ATSC
1. TV Card Driver:
2. TV Card: AVerMedia M791
2. TV Card Type: ATSC
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: ffdshow
MPEG2 Audio Codec: ffdshow
h.264 Video Codec: ffdshow
Satelite/CableTV Provider:
HTPC Case:
Cooling:
Power Supply:
Remote:
TV: Pioneer PRO-111FD
TV - HTPC Connection: HDMI

Rather than scanning for channels, I just imported them from an XMLTV EPG. As a result, there are some weak channels that I cannot receive all the time. When I try to tune to these channels, MediaPortal will hang/crash. The picture will freeze, and no buttons/keys will work. The last time this happened, I alt-tabbed and saw the Windows Error Reporting window saying MediaPortal had crashed.

The last message I see in tvserver_error.log is:

2009-01-22 23:13:31.287955 [13]: Exception   :TvLibrary.TvExceptionNoSignal: Unable to tune to channel - no signal
   at TvLibrary.Implementations.DVB.TvCardDvbBase.RunGraph(Int32 subChannel)
   at TvLibrary.Implementations.DVB.TvCardATSC.Tune(Int32 subChannelId, IChannel channel)
Exception   :Unable to tune to channel - no signal
  site      :Void RunGraph(Int32)
  source    :TVLibrary
  stacktrace:   at TvLibrary.Implementations.DVB.TvCardDvbBase.RunGraph(Int32 subChannel)
   at TvLibrary.Implementations.DVB.TvCardATSC.Tune(Int32 subChannelId, IChannel channel)

Has anyone else seen this problem?