USB-UIRT will not send a signal to Dish receiver

I am using a Dish ViP211 HD receiver and Vista Home Premium OS. I have run the BTV setup wizard and trained the remote control. However, USB-UIRT will not send a signal. When I launch BTV I can manually change stations by typing the station number and a signal is sent to the receiver correctly. But, when I schedule a recording, no signal is sent.
Does anyone have a solution.
Thank you.
Does anyone have a solution.
Thank you.