DISEqC switching problem with TBS 8920 DVBS-2 DBA driver

[rdmitry]

TV-Server Version: 19574 and older
MediaPortal Version: 19574 and older
MediaPortal Skin: basic
Windows Version: vista sp1
CPU Type: AMD 64 x2 4400+
HDD: IDE 40 GB
Memory: 2 GB
Motherboard: MSI
Video Card: Nvidia 6800
Video Card Driver: Nvidia 7.15.11.6925/11.12.2007
Sound Card:
Sound Card AC3:
Sound Card Driver:
1. TV Card: TBS 8920 DVBS-2
1. TV Card Type: DVB-S
1. TV Card Driver: 1.0.3.0/29.04.2008
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:
MPEG2 Audio Codec:
h.264 Video Codec:
Satelite/CableTV Provider:
HTPC Case:
Cooling:
Power Supply:
Remote:
TV:
TV - HTPC Connection:

Hello, I've got a problem with DISEqC switching on TBS 8920 DVBS-2 PCI card, using TV server. I have 2 satellites, connected to a 4 port DISEqC. I have 2 DVB cards: TBS 8920 DVBS-2 and old Twinhan SS2. Both have BDA drivers. If I use Twinhan card, all works fine, if I use TBS card, switch doesn't work. However, if I use BlazeDTV or DVBDream, LNB switching work fine for TBS card with the same BDA driver. Is it possible to fix this problem? If needed, I can provide remote desktop access to my computer

Dmitry