No signal on tuner B

I recently bought TBS TV Tuner TBS6991,For the TBS 6991: I have connected one lnb to tuner A and another lnb to tuner B. Windows Media Center says "No TV Signal Present" on Tuner B while Tuner A works fine. I have the same problem with DVB Dream and TBSViewer.

The lnb on tuner B is properly connected (I receive the satellite signal if I connect it to Tuner A).​
This problem can be solved by update driver to V1.0.0.4
here is the linker:
http://www.tbsdtv.com/download/document/tbs6991/tbs6991-windows-driver_v1.0.0.4.zip
 
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