TV watching during recording (1 Viewer)

[Jucca]

TV-Server Version: TV Server 1
MediaPortal Version: 0.2.3.0
MediaPortal Skin:
Windows Version: Vista Home Premium
CPU Type: Intel Core 2 Duo E6750 2.66 GHz
HDD: Samsung 500 GB
Memory: 2 GB DDR2 800 MHz
Motherboard: Asu P5E-V HDMI S775
Motherboard Chipset:
Motherboard Bios:
Video Card: Asus in motherboard
Video Card Driver:
Sound Card: Asus in motherboard
Sound Card AC3:
Sound Card Driver:
1. TV Card: Terratec Cinercy C PCI
1. TV Card Type: DVB-C
1. TV Card Driver:
2. TV Card: Terratec Cinercy C PCI
2. TV Card Type: DVB-C
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:
Satelite/CableTV Provider:
HTPC Case: Silverstone GD01MX
Cooling: Zalman CNPS9500 AT
Power Supply: Corsair VX450W
Remote: iMon
TV:
TV - HTPC Connection:

Hi,

Recording has started from standby stage.
After it I want to watch TV. It doesn't work saying "Timesifting is not possible ...".
Somebody knows what's the problem?

Regards,
Jucca