Possible getstream with multiswitch problem?

Hi, I'm using getstream for more than a year, and it works great. But lately I added a Televs multiswitch to my system, and found getstream could not work correctly with it. I've tested getstream with normal DISEQC switches before, and it works well, but it does not work with MultiSwitch. I've tested mumudvb, and found it works correctly. Is it possible that getstream send a wrong DISEQC sequence? How could I test it? Any suggestions? Thanks. Mike Smith.