Exception:System.NullReferenceException: ... TvPlugin.ChannelNavigator.ReLoad() (1 Viewer)

[Aquarius]

MediaPortal Version: 1.1.1
MediaPortal Skin: default
Windows Version: XPSP3
CPU Type: ATHLON 2500XP
HDD: SAMSUNG Spinpoint 350GB
Memory: 1GB CORSAIR TWINX
Motherboard: ASUS A7N8X E Deluxe
Video Card: Radeon XXL (9800 PRO)
Video Card Driver: Catalyst 10.2 Legacy
Sound Card: onboard AC97
Sound Card AC3: NVIDIA
Sound Card Driver:
1. TV Card: PVR350
1. TV Card Type:
1. TV Card Driver:
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: MPV
MPEG2 Audio Codec: MPA
h.264 Video Codec: SAF
Satelite/CableTV Provider:
HTPC Case: Silverstone LC13
Cooling: 7 fans, downnoised
Power Supply:
Remote: Logi 785, MCE
TV: CRT 16:9
TV - HTPC Connection: VGA-SCART

Hi all,
when entering the TV menue, nothing happens and I get the above exception. The menue is visible but no
TV Guides, TV channels or similar.

The Setup:

- MP 1.1.1- single seat
- firewall off
- MySql - working: tried with SQIRREL SQL browser
- TVService running
- Streaming Port 554 listening.
- SAF 5.
- Installation without problems.
- No plugins, default skin.

Thanks for any help.
Regards/Gerd