[Client]-streaming- zapping does not work (1 Viewer)

[infinite.loop]

Server:
TV-Server: 5-oct 10:17

1. TV Card: Technisat Skystar 2
1. TV Card Type: DVB-S
1. TV Card Driver: 4.4.0
2. TV Card: Hauppauge Nova-T USB Stick
2. TV Card Type: DVB-T
2. TV Card Driver: 2.5e

Client:
MediaPortal Client: 3-Oct

Windows Version: Windows XP SP2
CPU Type: AMD AthlonXP 3000+
HDD: Samsung 200GB
Memory: 512 MB DDR PC3200
Motherboard: Asus A7N8X Deluxe
Motherboard Chipset: Nvidia nforce2
Motherboard Bios: Award 1008
Video Card: WinFast A6600 GT TDH-128 (S-Video out)
Video Card Driver: Forceware
Sound Card: realtek
Sound Card AC3: coaxial out/ optical out
Sound Card Driver: 1.16
MPEG2 Video Codec: MPV
MPEG2 Audio Codec: MPA
HTPC Case: standard ATX case
Power Supply: Bequite 400W
Remote: Microsoft MCE Remote
TV: Panasonic 16:9
TV - HTPC Connection: S-Video

Network setup 2 PCs
- one TV-Server PC with TV-Cards
- one MediaPortal Client

The MediaPortal Client can not change the channel