System.FormatException: Input string was not in a correct format (1 Viewer)

[4rstJeep]

MediaPortal Version: 1.1.0
MediaPortal Skin: Blue3Wide
Windows Version: Vista SP1
CPU Type: Intel Pentium dual-core E2220(2.4GHz)
HDD: 640GB SATA 7200RPM
Memory: 4GB DDR2
Motherboard: NVIDIA GeForce 7100 + nForce 630i
Video Card: NVIDIA GeForce G100
Video Card Driver:
Sound Card: High-Definition Audio with 5.1
Sound Card AC3: Optical Out
Sound Card Driver:
1. TV Card: ATI TV Wonder HD 650 Combo USB (TVW650USB)
1. TV Card Type: ATSC
1. TV Card Driver:
2. TV Card: ATI TV Wonder HD 650 Combo USB (TVW650USB)
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:
MPEG2 Audio Codec:
h.264 Video Codec:
Satelite/CableTV Provider:
HTPC Case: OTA DT
Cooling:
Power Supply: LITEON 400W
Remote: Harmony 680
TV: Samsung LN46A650
TV - HTPC Connection: HDMI

I had previously had my TV server working well under MP 1.01, I have upgraded to MP 1.1.0 Beta and I can successfully setup the tuner, search for channels, and map them to a card. When I try to "preview" channels I get "Unable to preview:Unknown error" and the error.log shows "System.FormatException: Input string was not in a correct format." error. I have attached both tv.log and error.log. I do not have any 3pty plugins installed. Thanks for your help!!!